I've never played any UFC video games, but I've seen clips of fights, as well as fights from other MMA organizations such as Bellator and the World Series of Fighting, and they certainly look very different from fights in Street Fighter, Tekken, and Dead or Alive. Now, the latter two are slightly more realistic than the first, because there are no magical projectiles, but they too deviate from reality in that they feature juggle combos, as well as falls from one area of a stage to another.