-Eternal Darkness
-Chibi Robo (look at video first its quirky)
-Resident Evil 0 1 and 4. I rented PS2 version and played that first then the -Cube version. It is really bad.
-Baten Keitos is fun
-Zelda Wind Waker
-Star Fox Assault and Adventures are fun. Not great but fun.
-Skies of Arcadia
-F Zero GX (lots of custimization if youre into that, decent story, amazing graphics.)
-Zelda 4 swords is fun and cheap. Decent single player puzzle game. 4 people not needed.
-Battalion Wars. Great fun great story. A 7 really do to no multiplayer but a must if you want the Wii sequal as its got a fairly deep story.
-Pikmin 2. Dont let the graphics fool you this game is crazy violent. Acid, Robots, Flamethrowers, bombs, et al.
-Star Wars Rogue Squadren. (also great graphics. F Zero, Resident Evil 4 level)
-Metal Gear Solid Twin Snakes (amazing remake with better redone voice acting and 100X better graphics. Plus all PS1 unlockables are there like the tuxedo and ammo bandanna)
Thats all I can think of offhand.