It's a semi futuristic affair with really impressive weapons that look like they do real damage - I think reviews when it was released called it bullet porn.

I also really liked Battlefield 2 on PS2 - the main hook of the game is that you can hop from one solider to another round the battlefield so long as they are in line of sight, meaning you as the player can always hop tp where the action is and influence things the most.

If you're looking for the most fun you can have on a ps2 though, you want timesplitters 2 and a friend sitting beside you. The single player is great, the 2 player split screen is hilarious.