When I said 2D I meant side-scrolling. My mistake oops.
But you can't compare Unleashed with Colors. The gameplay is different in almost every aspect.
I actually enjoyed the Secret rings. You actually HAD to run forward and you couldn't stop and turn back. This made it much harder. Unleashed was alright. Not the best but I had fun.
Also, Sonic Heroes was win. Before you all say 'EW THAT SUCKS' we all have opinions.
Sonic Adventure (Just got it on XBLA) is alright to. Nice change from usual sonic games.