The original Street Fighter from 1987. I know it might be unfair to criticize a fighting game that came out when the genre wasn't fully developed yet, but if you compare the first Street Fighter game to pretty much every fighting game made since then, it feels very outdated, The controls are very unresponsive, the special moves only work half the time, in addition to being very overpowered. Personally, I think there is little reason to play this, unless you're curious about it or something.