Played through this game at least twice on a free weekend ages ago, and enjoyed pretty much every minute. All around solid experience with plenty of paths through a level and ways to deal or avoid enemies and killing all together. From pacifist to annihilation, there was always something interesting to try and pull off either using powers or trying to complete the game as humanly as possible. Still not sure why I've not actually bought the game yet though...

I really should pick this game up some time.