I had that, and I loved it. I d/led it and it just sucks. Yes, classic Sonic for new generation is good, but still. If you want to play these, do one of the following:
1. Download on VC
2. Buy Sonic Mega Collection (or SMC+)
3. Get an old Genesis if you don't have one already and get the originals
4. Emulate on PSP or something...
A good attempt, admittedly better than Genesis (although taking a [parasitic bomb] is better than playing that atrocious abomination), but they could've done better. Much MUCH better...
Also, am I the only one who wants the UDLR in Sonic 4?
Emulating on the PSP rocks(as long as you don't mind using Fast Emulation(water coloring is weird). I have Sonic, Knuckles in Sonic, Sonic 2, Knuckles in Sonic 2, Sonic 3 & Knuckles. I had Sonic CD, but I don't care for it much.
PS: Play Sonic(2 or 3 is prefered) with those red and blue 3D glasses.
PPS: There might be a seizure risk.