One of the prime reasons why I hate Sonic today, Sega revived his already battered-corpse and made him attract the kids who're still praising over his announcement in Brawl.
Sonic was indeed awesome in the 2D era but his 3D games BLOW and the kids buying those games are too young to realize good statistics of a game, so they will continue to release crappy 3D titles. Remember Shadow the Hedgehog and Sonic for the PS2-3 and Xbox 360? Yeah...
If anyone remembers 8 to 16-bit side scrolling as the 'core' of gaming. I call you, hard-core.
Yes, it will be nice to experience such a mini-version of the genre in Brawl's adventure mode as well as the fact that it's co-op.