Okay, having finally played a bit of Sonic Generations, I can safely say I COMPLETELY agree with Yahtzee on the jumping. The jumping is SO FREAKING DELAYED, in that you have about 1 second before the game realizes you pressed the jump button and they jump. Which wouldn't be so bad if the game isn't all about speed and requires, if not outright DEMANDS that you think fast. Unfortunately, not everyone's minds are as fast as Sonic.
It irritates me to see Yahtzee go on about how nostalgia irritates him so much in the Unleashed review and then come back to this one blindly labelling the modern gameplay as inherently bad while slobbering all over the classic gameplay as if it's not just him wearing too many pairs of nostalgia glasses.
I've never been a fan of sonic games. Ever. I just can't get into them. So for me, every 3D sonic is about on par with every 2D sonic. Except the 2D sonic doesn't talk and that makes him about 20 times more likeable.