its in flash on a web browser and using a keyboard but it aint bad http://www.kongregate.com/games/GameTap/street-fighter-2-ce
The speed is slow, the sound are not the original, and there is some lag in the controls. Nice try thus.
I tried this out on Kongregate a while back, it might be a decent way to show the younger generation what fighter games were like (includes me actually, I started with Virtua Fighter..), but it's not too well done. I could think of a way that anyone can play a better, more authentic version that would take about five minutes to set up.
just get gametap and play about 10 versions of SF and KoF for free and loadsa others. gamepads work well with them too