Got my ps2 a bit ago and im really digging it.. I own/borrowed
MDK2 (pretty good, not as good as 1 though IMO)
Final Fantasy X (borrowed, for some reason, i dislike it, but i love 6-9)
Metal Gear Solid 2 (love this game, recently finished 1 as well on cube)
Metal Gear Solid 3 (havent gotten far, but starting it up again)
God Of War (love this game, getting my own copy soon)
Jak and Daxter (HATE it, but i love crash bandicoot (same company))
Thinking of getting:
Ratchet and Clank 1-3 (played a bit, was fun)
Klonoa 2 (LOVED the first)
Street Fighter Anthology (love these games)
Okami (never played, supposbed to be fiya)
Resident Evil 4 (own 1-CV except this one and 0, looks hott)
Any other suggestions/opinions? I'm willing to go for those "unpopular games" as well