I really enjoyed Generations, it was a very good game and was a great return to form.
However, I would have made some slight changes that would make the game a bit better.
It's a weird thought, but Generations doesn't really feel like a game, but more of a level collection. I would have made it so you started on classic Green Hill, moved on to two of the best missions to emulate act 2 and 3, and then do the same for every other level. I would have put Metal Sonic after Chemical Plant, Death Egg Robot after Sky Sanctuary, then shadow. Perfect Chaos after Seaside Hill, Silver after Crisis City, and Egg Dragoon after Planet Wisp.
I would have changed a few levels too. I would have changed Seaside Hill to Casino Park, Crisis City to Tropical Jungle, Rooftop Run to Cool Edge (just so we got Icecap) and Planet Wisp to Asteroid Coaster.
What are you're thoughts? What levels would you have?