Since I just got done playing the Silver demo, I might as well sum up all three campaigns since their stages are all finished and that's pretty much what matters the most. Story? Who the fuck cares? Sonic 06's story is garbage anyway, same thing goes for the boss fights, if anything they'd probably drag my rating for this down instead of helping it go up.
Sonic: Very good, there are the obvious improvements on the original game and all, but the stages also find a pretty neat middle ground between Adventure 1 and 2's approaches to level design, making it feel like a proper evolution of those games. 8/10
Shadow: Meh, I like the core gameplay and the implementation of the chaos powers, but the bland and repetitive "combat-oriented" level design from the original game is still here, so are the shitty vehicle sections. Not terrible, but painfully boring. 5/10
Silver: Holy shit they fixed him! Well, for the most part. He doesn't move at a snail's pace and the telekinesis doesn't have nearly the same collision problems found in the original, but there are still the occasional odd moments where objects hit enemies, but don't cause damage for some reason. The levels are generally good with a lot of solid platforming sections and some cool environment interactions and hidden power-ups to discover. Genuinely surprised that I actually enjoyed this, considering I remember it being the worst campaign in a game where all three campaigns were awful in their own way. 7/10
Sonic: Very good, there are the obvious improvements on the original game and all, but the stages also find a pretty neat middle ground between Adventure 1 and 2's approaches to level design, making it feel like a proper evolution of those games. 8/10
Shadow: Meh, I like the core gameplay and the implementation of the chaos powers, but the bland and repetitive "combat-oriented" level design from the original game is still here, so are the shitty vehicle sections. Not terrible, but painfully boring. 5/10
Silver: Holy shit they fixed him! Well, for the most part. He doesn't move at a snail's pace and the telekinesis doesn't have nearly the same collision problems found in the original, but there are still the occasional odd moments where objects hit enemies, but don't cause damage for some reason. The levels are generally good with a lot of solid platforming sections and some cool environment interactions and hidden power-ups to discover. Genuinely surprised that I actually enjoyed this, considering I remember it being the worst campaign in a game where all three campaigns were awful in their own way. 7/10