This is just my opinion but, I still think that Sonic Adventure 2 is one of the BEST games of Sega. Sonic Generations on the hand, levels just seem somewhat dead while Sonic Colors it all bright and full of colors, which made the game fun.
What's your favorite part about Sonic Adventure 2? :) Mine personally is the fact you get to play as Dr. Eggman which you never got to do that before, plus I love the Chao Garden and how they upgraded it from the original game. The only thing I don't care for is the voice acting, mainly Rouge's voice actress. :\ To me it sounded like she wasn't trying, and in some scenes were sort of bad because of that. >.>