Some people can see that I've already made a topic like this for PS1 games, which have so far been very good suggestions. In my searchings, though, I've realised something: PS2s are really cheap now, and the games are still pretty easy to find, and beyond belief some developers are still making games for the thing.
In a nutshell, I spent $100 AUD on a pre-owned PS2 Slim and Persona 3 & 4. Keep in mind that in Australia games and consoles are amazingly expensive compared to a lot of other places.
So, pretty clear: what PS2 games should I seek out, or are the best in your opinion? Some I've come up with off the top of my head:
Suggestions are appreciated, and even just gushing about why you love one game or another so much.