Oookay... let's start with the Tekken series. For the PS2, there are Tekken Tag Tournament, Tekken 4 and Tekken 5 - I prefer TTT out of the bunch, but I'd recommend them all.
Then there are Soul Calibur 2 and 3 (with weapons). Personally, I prefered SC2 (and the XBox version at that - it had Spawn instead of Heihachi), but SC 3 still is a beautiful game. I'm just not too partial to the green girl character they introduced in SC3.
Dead or Alive 2 Hardcore: if you like jiggling breasts, this would be your game
. But it's good, anyway. Then there's Virtua Figher 4: Evolution. I'm not really a fan of VF, but VF4:E is better than vanilla VF4 - it has more characters and less glitches.
I haven't played Dragon Ball Z: Budokai Tenkaichi 2 yet, but I'd like to - it has over 50 characters and wonderful cel-shaded graphics. It's said to be frustatingly difficult, though, so I didn't dare to order it yet.
If you like older games and/or Starlight Express
, there's the re-release of Fighting Vipers. It looks a bit aged, though, and was a lot better for arcade.
Mortal Kombat: aaaah yes
. I own MK: Deadly Alliance, MK: Deception and MK: Alliance for the PS 2. MK
A is the oldest out ouf the three, MK:A the newest. MK:A has a near-complete roster and a 'make your own fighter' feature, but the Konquest mode - a beat'em up adventure game - is far shorter than in the previous game (MK
eception), they simplified gameplay even more with the use of only one type of Koin instead of five or six, and some character endings were... um... let's rather NOT talk about it. Personally, I prefer MK
because of its extensive Konquest mode. And, of course, it has a Tetris clone mini-game.