Favourite PS2 game?

Most of you probably don't even use your PS2 anymore - you'd either have a PS3 or the 360... Some may have a Wii. Does anyone have a favourite game on the console? Or favourite set of games. Personally, I like the Call of Duty games - FPS ftw. Also, we can't forget the GTA games - both Vice City and San Andreas. I thought that they were both replayable (even though I never completed them). I used to go on it, fuck about until I got bored then went and did something productive.

Anyone have any games that they can't stand? I hated the Splinter Cell games (I had two) but I hate games where you're on your own - I like to have bumchums with me.