Games worth playing for the ps2?

Yeah well, the console isn't mine, I'm really giving a gift/doing a favor to a friend, and i get to play some games, i own a wii, gamecube, n64, etc and all the games are legit, no pirates or anything, including my DS games.

And i found THAT Valkyrie project boring well.. it didn't seem like my style, i like real time rpg battles like ToS and stuff, but that game gave the feeling of a lame real time thats not really real time battle... and the whole einherjar thing was confusing (i heard einherjar and i though riviera... too bad its nothing about it xd)

So far i have 3 kingdom hearts, the 2 final mixes, disgaea 2, katamary damacy, metal gear solid 3... is there any other for ps2? or should i get MGS 1 and 2 and play it there? Also I'm looking for action or platformers... are there any on the ps2? i "wanted" to get God of war 2 but i don't have a dual layer disc with me as i said before...

@baklava, well, i own ToS for the gamecube, i just want to play the PS2 version (which is in japanese) for the hi ougis and i can't find it...

Action eh? I can't say that I'm an expert in that area, but here goes I guess.

I think the Ratchet and Clank series would be a decent thing to get into for starters. If you hadn't played it on another console, Pychonauts had a very clever script and Mario Galaxy mechanics before Mario Galaxy on one of the stages. If you like farming down dozens of mobs at once and have a little tolerance for a bit of a convoluted skill/equip system, then Shining Force Neo/EXA might not be too bad either. Dawn of Mana wasn't a really good "game", but the game mechanics are reasonably fun to play around with for, and since you won't be paying anyway, I think it would be a decent 5-6 hours.

Again, I'd like to recommend Star Ocean 3 and Rogue Galaxy. Star Ocean 3 since the battle system is more or less a copy of the tales games. Rogue Galaxy because it was just a good game and still has that action RPG element that reminds me most at the moment of Kingdom Hearts (Really high jumps).

Given what you've said, you probably wouldn't like the Atelier Iris I mentioned earlier.

EDIT: I'm a bloody slow poster.