MGS3, God of War, Resident Evil 4, SOCOM, Dragon Quest 8 and Madden if you like that sort of stuff.
If you're looking for a great RPG(and are waiting for FF12) I suggest you pick up Dragon Quest 8:Journey of the Cursed King. A long RPG that's challenging, the art is done by Akira Toriyama(the man who drew DBZ), the music fits the mood perfectly, and the combat and leveling system are great. The environment you run around in is HUGE, even rivaling Oblivion's environment.(that's right, the huge RPG on the 360)
The only problem I think anyone would have with this game is that sometimes you'll find yourself trying to level up for hours to earn gold for weapons, and so you can move unto the next area. It's worth it though, it's satisfying when you characters level up though. Easily one of the best RPGs on the PS2. Also, the game isn't as serious as FF, but that's one of the things that make it fun to play. People who like RPGS like Earthbound, SMRPG will like this, and so will the people who play FF, and Chrono Trigger.