KILLZONE: LIBERATION
good about this game: it takes a different direction from the original first-person game. it advances the plot of the Killzone universe, with some pretty big character-related events. it has a fun tactical element (where you order a teammate to help you out), as well as good level designs.
bad about this game: first off, even with the downloadable extra level, it's way too short. the tactical element is a under-used, though it'll still be fun for people wanting straight shooting action. however, if you were a fan of the first-person PS2 game, you may be disappointing with the tiny third-person characters here.