Speaking of Super Sonic, why did he suck so much in Generations?
Playing as Super Sonic is one of those things I think they add now because it feels like they have to for fanservice but I don't think they actually understand what makes Super Sonic "cool".
There's no sense of accomplishment for acquiring Super Sonic anymore, and depending on the game, Super Sonic is either really super boring (just infinite boost) or crazy obnoxious (when they try and attach weird mechanics to him or put him in situations where he's useless). There aren't nearly enough rings in most Sonic Generations levels to maintain Super Sonic, and Modern Super Sonic in particular burns through rings at an alarming rate - most levels don't seem to contain more than 200 rings total, and Modern Super Sonic will eat through 100 rings in 5-10 seconds if you're using boost a lot.
So Super Sonic is just "there", but you didn't go through anything challenging to get him, and the form isn't something you use a lot because there's more useful and more powerful equip loadouts you can put on Sonic.
Plus, the idea of Super Sonic in general is just starting to get old. Spoiler for how every mainline Sonic game since S3&K ends: Sonic uses the chaos emeralds to transform in to Super Sonic and then plays an annoying minigame to beat the final boss.
I think Sonic Colors is the one time that doesn't happen, though there could be arguments made on whether or not that is a mainline game and whether or not they actually had a Super Sonic section planned (the DS version has one, it wouldn't surprise me if the Wii version did at one point, too, and they just ran out of time and couldn't include it).