Two player beat 'em up.
I'm pretty sure this was the first title I got for my SNES (it was bundled with it), and I remember spending many nights on it. I got my money's worth back then, and even though this is the non-Turbo edition I jumped for it again now for the nostalgia factor. The emulation is very slick, and I find the Wii Classic controller is perfect for SNES stuff. I quickly got backup to speed and found myself stumbling at the same points, Vega and M. Bison.
I'd say this was well worth it if you're looking for specific nostalgia action and you knew the original non-Turbo edition well. Others may wish to wait for the Street Fighter II Turbo: Hyper Fighting for what is surely the definitive version of the game on the SNES.