Assassin's Creed, that game had no replay value and it's resell price went wayy down.

Lost Planet and Armored Core 4... they where decent i guess... but a little to slow and different for my liking,

MattyDienhoff:
Need for Speed Carbon.

Just more cliched, groan inducing street racer crap with cheesy dialogue. I knew all about that, of course, to tell you the truth I just wanted some different scenery in which to film police chases, but it turns out Carbon somehow managed to take the magic out of them too, and the chases are never even half as epic as they were in Most Wanted...

Totaly agree.

Also Halo:Combat Evolved on Xbox Originals.

I could have bought the game for half the price at a local Best Buy. Plus, it wasnt as good as people made it out to be...

Dark Sector.

The Darkness.

Good idea, but bad implementation. It gets SO boring riding the goddam subway from location to location and having to watch the little loading cut scene, and to make matters worse, Jackie can't run. It's one of the few games I've played and haven't had any desire to continue.

Harry Potter 1 AND 2.
Halo 2 and 3.
Assassins Creed.
Splinter Cell: Double Agent (360)
Both Farcrys. (Xbox one is crap and I can't run the PC one. It wasn't optimised AT ALL)
Worms Armageddon (Awesome games. It just wont work on my PC D:)

GTA 4. Though I did return it two days after purchase. I found it as interesting as watching my toes.

City of Villains - It was only four dollars but still I had to go through all the trouble and then I hated it.

Dark Cloud - It was a gift but I hated that game.

That Fullmetal Alchemist game, the first one that came out in the US. It sucked. I didn't need a game that I could beat in 13 hours.

Quite a few actually, but the ones that really stick in the back of my throat are:-

Kane&Lynch:Dead men
Blacksite
Age of Conan

The first 2 were impulse buys during a period of gaming boredom. I'll never make that mistake again.

Age of Conan I had been following for some time, and it was looking promising so I pre-ordered. Another lesson learned.

Spartan Bannana:
Assassin's Creed, that game had no replay value and it's resell price went wayy down.

Oblivion - My friend recommended it to me and he has a poor choice in games. I heard it was good from other sources. I bought it and immediately thought, "I'm gunna regret and return this."

Returned it two hours later.

Annnd...

DOA 4 - Stupid annoying difficulty curve. Plus, it's stupid for a button-masher. Gunna return it and get Soul Calibur IV :D

-Rad.

Family Guy on PS2, it was cheap, and it showed

Gore
Simpson's hit and run
Space colony
The game of LIFE
Mob Rule

Golden Ring. Awful awful awful PS2 launch title game. First person jrpg. It was as bad as it sounds.

Hellgate London, turns out my labtop can't play it, had to return it the same day

the 'golden-eye' game for xbox.
anonymous bad guy.
being a bad guy is either fun, and short lived due to dumb AI with solid firefights, or tedious and infinite due to AI telescopic x-ray super night vision and their guns that fire agent-seeking bullets out of 10hundredmillion round magazines.
and you never get to kill Bond! he just dies on the first level and you get blamed for it and fired!
and how in the name of Zeus' BUTTH01E does a gold eye produce an EM field that deflects bullets?! it's a cool concept if it worked, and didnt break and short out anytime some one blew a spitball at you.

Condemned 2, my god that game is clumsy. The only game I own I know I will never finish.

Sim Shitty societies, saw it for a fair price... but still then wasnt even worth it... it was like such a watered down version of Sim City....

I dont have many regrets, since I do quite a bit of research before purchasing games. One I probably regret is SSBB, tonnes of fun for like 2 hours... then, meh.

I'm going to have to say Dead Rising. The gameplay itself wasn't the problem, but the difficulty curve is so ungodly I couldn't stand playing it for more than 15 minutes at a time, and the on screen text is too small

UPS Express:
I'm going to have to say Dead Rising. The gameplay itself wasn't the problem, but the difficulty curve is so ungodly I couldn't stand playing it for more than 15 minutes at a time, and the on screen text is too small

I personally never found it that hard? but I had spent some time with the demo. But I agree the text was tiny!

Oblivion... such a borefest.
Oh wait, i didn't even buy it, i borrowed it from someone.

Gun Griffon Blaze..

Granted it was only $4, but the non-western style control scheme that ISN'T changeable, completely ruins the game.

Monster Hunter Freedom- BORING!!! Unfortunately, I didn't research this game enough before I bought it. I was expecting some exciting fights against bad-ass monsters, like I saw in videos and screenshots. Instead, I spend hours walking around finding plants, bones, or other useless crap. The controls were terrible, Load times were a pain, and walking from one screen to another took forever. I know that some people like this kind of thing, but this was one of the most boring games I've ever played on any system.

WWE Crush Hour- Once again, it was my fault for not researching enough into this game before buying it. Of course, back then, the thought of playing as The Rock (My absolute favorite wrestler at the time) driving in a monster truck with rocket launchers blowing things up was a dream come true. I couldn't even get past the first few levels of it's single player because of the almost impossible objectives. At times, the game screwed you in the ass so hard that you wouldn't be able to shit right for a week. Props for anyone who knows what movie I referred to.

Mr Digger on XBLA. What the hell was I thinking.

Metal Slug 3 on XBLA. It wasn't half as long, and the ending wasn't half as epic as the original game. Oh, and Virtua Fighter 5. After I found out this game has no story at all, it was total shit. And no, I can't "trade in" games here where I live.

battlefield bad company, lucky i kept the recipt to get fallout3 later on :)

Oblivion.

Every time a new game comes out from them, I look at it and get excited, and tell myself that I am really going to like it. Knowing full well I hate the Daggerfall-esque engine. And every time I buy into it thinking "its gonna be better", and every time I regret it.

Red Shadow:
Matrix: Path of Neo. Awful awful broken mess of a game. I paid £4 for it, and that was far too much.

Shadow the Hedgehog: Sonic characters with guns... there are no words.

This is true...

Ty The Tasmanian Tiger... It was good but now, ERGH! The voice acting is awesome until the second time.

Halo
Halo 2
Halo 3

Every time a new one came out, I bought into the hype and was then disappointed. Co-op was fun, but I always felt let down after the fact.

Black & White (I've ranted already about this game in other posts)
Deus Ex 2 (omg abortion)

Unreal Championship - The damn thing was pretty much dumbed down port of UT2004.

Resident evil 4 for pc

god... worst thing ever didnt even beat the first level codent get by the rock that comes rolling at you but they had such shitty controls I will NEVER play it again I shot it with my
brothers AR-15 (assault rifle)

GOD DAME CONTROLS

Eternal Ring - I won't be surprised if no one's heard of it, it was a complete heap of a game.
Basically a FPRPG (First Person Role Playing Game) about some guy, seeking out a ring or something like that, i know the story as a whole wasn't too much different from what the story implies, but i was playing for about 10 minutes before i started to get fed up of watching my character's hand going back and forth in what i suppose resembled a stabbing motion against Crabs.
It felt like Morrowind for the Xbox all over again.
(Although Admittedly you can at least turn off the 3rd person view on Morrowind.)

FFXII - Most people i talk to seem to like it, i however can't seem to get the appeal, i love the FF series as a whole, apart from some of the recent Nintendo spin-offs that i've never looked into, but never had the capacity for caring about it. i think what turned me off XII most was probably the "Hey look, we're emulating an MMO" style of combat.
Wasn't a very smart choice in battle system especially when a fair few of us were used to Kingdom Hearts 2 by that point.

I kinda regret buying Overlord, not because I thought the game was bad or anything, but because I never play it because I've developed an attachment to my minions and I'm afraid that I'll end up getting them all killed, which is the same reason I avoid Pikmin (Yes, I know It's weird). I also wish I hadn't bought Mass Effect, because there was no replay value. I found the Techs and Biotics to be useless, so all that I did was use guns, making every playthrough virtually identical.