teh_J0kerer said:
classic sonic levels look great, but I dont think I could stand the modern sonic levels
I thought that too, going into the game. But while they're not as fun as the way Classic Sonic plays, they've tempered the badness by making a lot of the modern Sonic gameplay 2D instead of 3D, and emphasizing on-rails racetracks over sloppy 3D platforming.
Really, Modern 3D Sonic falters when it tries to be Mario - when it tries to let you explore an open platforming environment, or when there's lots of skilled jumps to be made in 3D. Modern Sonic's movement mechanics are really geared towards being something more akin to Amplitude or Canabalt - you're screaming down a series of tracks, and it's up to you to time your response to each obstacle and/or move to a different track in order to achieve the fastest time. And when you have a level memorized and can beat it at what looks like inhuman speeds it can be as thrilling as beating Through the Fire and Flames in Guitar Hero - it's all about pattern recognition and fast fingers.
Except, however, when you reach the chunks of the game where there's a series of floaty platforms and the rails are taken off. If you use your homing attack at the wrong time (you get one per jump) you fall to your death. if there's a slight miscalculation in your angle, you miss and fall to your death. If you think you can get to a platform but it turns out you can't because it's part of another track and is just higher than you can jump, you fall to your death. If you're trying to jump up to the next platform but, uh oh, the lock-on system has locked on to enemy below/behind you, you get dragged backwards through a game that's supposed to be about speed going forwards. This is what makes Modern Sonic's gameplay frustrating.
But Sonic Generations makes Modern Sonic work because the free-form platforming is kept to a minimum - it's still there, and it's still frustrating, but for every minute you spend wishing the platforming mechanics felt better there's a minute of really great 2D gameplay (with Modern Sonic, mind you) or really fast on-rails twitch gameplay that gives you a great sense of speed.
Ultimately Classic Sonic plays better - it's a tried and true formula - but the Modern Sonic bits aren't unplayable. They're just flawed.
Edit: Also, I'll put it this way: Half of the game, challenges included, is really awesome 100% Corn-Fed Home Grown Traditional Sonic Gameplay. The stuff people have waited over a decade for, barring a few GBA/DS titles. The other half of the game is 1/3 good-but-not-as-good-as-classic 2D gameplay, 1/3 screaming-down-the-track twitch gameplay that feels really great once you start getting used to the idea of being on a rail, and 1/3 sub-par frustrating platforming.
That's 5/6 of a game that ranges from amazing to enjoyable, and 1/6 of the game that's sort of ass.