I always finish games, except sandboxes. I've finished everything for my PS3, but my PS2 there is GTA:VC, GTA:SA and Bully that aren't done. Probably why I'm holding off on GTA IV.
PSN: EDguila
PS3 library: Motorstorm, Assasin's Creed, Orange Box, Uncharted:DF, Metal Gear Solid 4, Resistance:FOM, Rachet & Clank Future:ToD,
Near future: Folklore, SOCOM Confrontation, BioShock, Little Big Planet, Resistance 2.