The Batman Arkham games (though I know it's not actually a fighting game) but all the animations are done with motion capture suits, and they build off of that. Whereas the flipping back and forth is completely stupid, the actual attacks themselves are legitimate. Also, some of the basic combos in the Naruto Ultimate Ninja games are pretty close.
None. Tekken is the only one of these that actually bases its moves off of real martial arts, but the physics are definitely wrong.
Which fighting video game series do you consider most realistic? Street Fighter, Tekken, Mortal Kombat, Killer Instinct, Double Dragon, Soul Calibur, Battle Arena Toshinden, Tobal, Dead Or Alive, Virtua Fighter, The King Of Fighters, Art Of Fighting, Ehrgeiz, Fighting Vipers ...or some other?