Game Trailer review is
here.
It's a 32 player, online only, third person shooter. There's a variety of different weapons and vehicles which allows different play styles. It's very well balanced with no weapon/vehicle having the upper hand. The graphics and sound are good, and there is no lag. The game's just fun, it's one of those games where you can just pick it up if you have a spare half hour and have a blast in.
It is online only though, there's no single player, offline mode at all. If your connection to the PSN isn't very stable, probably not worth bothering with.
Available for download for 20 quid, or there's a boxed version for around 30-35 quid which comes with a headset. The following code can be used to get a fiver off from GAME:
AWDC07XM
http://www.vouchercodes.org/