and yes, Bully is worth more than ten bucks.
Which Jak games and Ratchet and Clank and Sly Cooper games should I buy?
Jak 1 is by far the best of the series, but some people think it's the worst. Try them all, they are all awesome regardless. Ratchet 2 and 3 are still the best of the series, don't let those people who say the ps3 games are better fool you. But you should start with Ratchet 1, because it's an amazing game and it sets the story and stuff.
Sly 1 is platforming goodness, but Sly 2 and 3 blow it the **** out of the water.
And are the first-person shooters on PS2 any good? The only one I'm thinking about really is Max Payne.
Max Payne and Max Payne 2 are awesome games, but they're not FPS. I'm someone who only liked FPS in the PS1/PS2 era. Medal of Honor: Frontline is easily the best FPS on the PS2. It comes bundled with Medal of Honor on the PS3 in HD.