TRY TO KEEP YOUR FEET RIGHT ON THE GROUND
Generations isn’t perfect. You’ll still find yourself dying for no reason as modern Sonic because you randomly ran off a ledge or missed a jump that you shouldn’t have - a problem that has plagued the hedgehog in the 3D space ever since Sonic Adventure.
Switching back and forth between Sonics isn’t always the best, as it can sometimes be confusing which Sonic has what moves, especially since 2D segments are scattered throughout modern Sonic's levels. An option to play the game straight through as one character, and then the other would’ve been an easy fix.
There’s also an RPG element to the game that lets you spec your Sonics with special abilities, such as the aqua shield from Sonic 3 and the ability to land on your feet after getting damaged. Unfortunately, these abilities are hardly noticeable in gameplay and honestly don’t make much of a difference.