This game is actually quite good. Unfortunately they removed everything that was nostalgic about the SNES version. Mainly the graphics and the audio. So it makes for a port of an old game that doesn't leave you with the same feeling you had when you played it on the SNES.
HOWEVER, the game is a lot of fun and had it been a BRAND NEW Ninja Turtle game, it probably would have recieved a much higher score.
If you want a Ninja Turtle game that is a lot of fun (and probably the best Ninja Turtles game, next to the Arcade game) then I say buy it. Especially for $5
If you want to be reminded of playing the game on the SNES, get an emulator or hope it comes out on the Wii's virtual console.
Yes, I would have prefered a straight up port of the SNES version with 16bit graphics and all, but the game isn't a complete waste like everyone makes it out to be.