It makes Sonic seguinte Gen look like super-homem 64. Any other 3D Sonic game does, actually. Classic Sonic's super form in it is not what you'd think it would be, but still a nice game.
Let's see... Generations has boost-to-win tactics through memerable stages, awesome graphics, the seeming end of Dr. Eggman (in which he'll probably return in a ridiculous plot in the future), the ability to choose what songs to play while going through stages, and very nice boss battles. What does 06 have? Glitches, a poorly written story, ridiculous carregando screens everywhere, and... do I really have to say the last thing?