Frankly if you didn't buy Sonic Colours your totally part of the problem, as far as '3D' or 'Modern' Sonic goes, Sonic Colours is the shit.
Amazing music, absolutely fantastic locations/levels, power ups that add to the gameplay instead of break up the fun, not to mention beautiful graphics. Even the story was quite good, saturday morning TV affair but for a Sonic game it wasn't trying to be overkill persudo-mature, time traveling love triangle Dr Who shit.