Graphics - Stunning graphical tricks and effects.
Sound - Excellent throughout.
+ Awesome setting
+ Great action, brilliant high-end weapons
+ Artificial Life fun to be around
+ Genuinely does new stuff.
- Awkward side missions
- Crap script, story-telling and characters.
Sounds like DOOM3 to me... "been there, done that", why would I want to do it again? Although I'll admit that the nature does look cool and it might be nice to wander around the forest and stuff - much better than plastic mars base.