I like most fighting games except Tekken.
Why, out of curiosity. I hope it's not a case of "Overrated!1!1two!"
I can list some favorites, but I don't think I can list a singular one.
Marvel Vs. Capcom 2 (I remember playing the first one, then playing the MVC 2 and going "Oh ****! Look how many characters there are!")
Tekken Tag/Tekken 5 (Tie between the two)
Street Fighter II (a-duh)
Guilty Gear Isuka (If you don't like Guilty Gear, I hate you)
Mortal Kombat II (The new ones suck, but the classics are still good for what they are)
Jump Ultimate Stars (Took what Jump Superstars did and multiplied ten-fold)
Super Smash Bros. Melee (I know you said BESIDES Smash, but there was no way I couldn't include this on the list)
Dead or Alive 4 (Favorite game on the 360)
King of Fighters '98 (One of SNK's best)