God of... Whoa.
I'll be the first to admit that the best game on PS2 (even beating out longtime personal fav FFX) is God of War. No contest. After renting and beating it two or three times from Gamefly, I just picked up a copy on eBay for $8, and it's still an amazing experience. Needless to say, I'm super-psyched to play the sequel without having to upgrade to a $600 PS3, even though they're easy to come by, in order to play it (hooray for late-stage PS2 development!). With Component Video enabled, GOW looks easily as good as Ninja Gaiden or any of the top-shelf graphical masterpieces on Xbox.
And the sequel...oh boy: