I just got this game for the PSP. I had the original game for the PS2, and I loved it... so getting a full on action game like this on the PSP is freakin' awesome!
Video quality is brilliant, the graphics are almost as good as the PS2 was. It's also a whole new game, so it's not repetitive to those who've played the PS2 version before. The same kind of combat, of course... but with a whole new bunch of weapons (I've got the glove of Zeus or something recently... it's touch, but doesn't have good range).
Anyway. Brilliant game.