Just beware it does start very slowly, and while those sections would have been bearable at launch due to "ooo shiny next gen graphics", it now feels like a crap version of half life 2. However once you amass most of the wepons and hit the chedder gorge sort of half way mark the game picks up massively and goes from 5/10 to 9/10.
It's a bit like crysis, in that you can play it like a standard shooter, poping off shots from a distance only using the standard guns. Or you can run in use all your abilities and feel like a god!