about sonic generations yea, it feels good, i never gave too much attention for it until a few days ago when i got to play more, it's funPlay the romhack Sonic 3 Complete. It combines Sonic 3 and Sonic and Knuckles in the way they were supposed to be played.
Also, talking about 3DS Sonic games, the 3DS version of Generations is pretty good, and so is Sonic Lost World. (Gameplay-wise, it's much better than on Wii U/PC, graphics-wise, worse)