Last week, I finished my first ever play-through of Resident Evil 4 on the Wii. Despite its slightly aged graphics, I found the game stunningly good, and I had a blast playing (I could hardly stop). It is a must-buy for your PS2 if you don't have a Wii. http://www.metacritic.com/games/plat...ent%20evil%204

A few other superlative games for the PS2 that have not been mentioned are Ico, Shadow of the Colossus (from the makers of Ico), and Okami. I think you would find these three games very engaging, Swae; they are all highly original and artfully designed. But don't take my word for it:

http://www.metacritic.com/games/platforms/ps2/ico?q=ico
http://www.metacritic.com/games/plat...dow%20of%20the
http://www.metacritic.com/games/plat.../okami?q=okami