Set pieces barely function
Chunks of the level don't load frequently
Feels like stiff trash that you have to play carefully so you don't die to random debris or the occasional glitch in every level
Presentation is mediocre and the aesthetics is amongst the worst seen in a Sonic game to date

I gotta say this is one of the worst experiences I've ever had with a game. Some of the levels don't even load until you stand in place for a solid 3 minutes.