I think I can answer that to some degree of accuracy. Tekken and Brawl are much faster paced and have less joystick combos unlike SF. The fact you have full combos for one button in Tekken and Brawl (I assume) also weighs in that in SF, you have two punches and two kick. also, the character's lack the ability to run, and rater, hop forward a little.
Also, I don't like SF that much either, but the video is damn funny.