Pros:
Excellent graphics, frame-rate and particle effects.
A unique and addictive gun customisation system. Lots of different guns, connectors and mods to play around with.
Fast and challenging gameplay with full use of physics engine.
No difficulty settings. You can choose more challenging fights if and when you want.
Well priced at £10.
Cons:
Cheesy and repetetive dialogues.
Steep learning curve. You die a lot at first.