One thing that I hate the most is how they handle Super Sonic.
It's supposed to be a reward for getting all of the Chaos Emeralds not a requirement. I decide to get all of them to zoom around all the stages as Super Sonic, a double-edged sword depending on who's playing and what stage (Super Sonic in Metropolis Zone is death, I tell you). And it hardly changed the endings much at all other than you don't have Dr. Robotnic/Eggman with a shit-eating grin holding whatever Chaos Emeralds you didn't have saying TRY AGAIN.
I don't want to have to use all 4-8 jerkoffs to get one Super Sonic stage where I actually have to pay attention to what I'm doing.
While I'm at it, what's with the Sonic Advance series? Why do I have all these useless moves? Why are they're hardly any enemies to speak of? (Not that Sonic as much, but too many a time you're just holding right without being interrupted by some goddamn mantis throwing it's arms at you)