Maybe it's the deliciously satisfying procedural damage. Perhaps it could be the themes and motifs pulled from a hundred and one of my favourite works of science fiction; from films such as The Terminator , Dark City and Blade Runner, to the writings of Asimov, Clarke, and Heinlein.
Fantastic set-pieces and enemy design; particularly the bosses; Tight gunplay compliments an excellent story; Tries to innovate in terms of voice commands and interaction..
...but doesn't always succeed; Conversations can sometimes feel a little superfluous; Context-sensitive buttons could be sharper