A solid FPS for the ps2.
Story wise, the game is decent. It takes a while for the story to get interesting. It starts slow, and towards the end the game picks up pace with more helghast and helghast that are harder to kill. Its decent for a old school FPS on the ps2.
Other than campaign, the game has online multiplayer, and offline multiplayer. Offline multiplayer can be split-screen, has AI bots, and has a ton of customizations for each match.
The game's graphic's are well done on the ps2. But he game does have a few flaws/glitches which are mainly graphical glitches. Nothing game breaking though. You can also fully customize the controller button configuration, and the analogue sensitivity too.
If you have a ps2 and like FPS games, then I'd recommend you getting this game. It has replay value, offline split screen multiplayer with AI bots, decent lengthy campaign which can be played in many ways due to the characters you can choose to be, online multiplayer which I belive still has players. At the low price it is at, there isn't anything to lose. It's a good buy.