There are many things to credit Street Fight II with.  It made fighting games popular, extended the life of the arcades, and made six button combo craziness all the rage.  But Street Fight II is really all about the catch phrases and super move motions.  Street Fighter II revolutionized the entire video game industry and constantly praised as one of the greatest games ever, a game many spent entire allowances on arcades not realizing the game would eventually be released for every console ever, but all a gamer needs to say is hadoken and cup their hands to show they are shooting out the projectile.  Only wusses do sonic booms.