Finished this today holy shit what an awesome game. Definitely one of my favorites of this generation. I was planning on playing Black Ops SP next, but I can just tell that for a while, anything else is going to feel like a step down compared to the controlled insanity of this game. The Kreon, the collapsing bridge, the zero-g part all memorable and awesome. And not to mention how well it controls; the game is just a pleasure to play.
I had no idea what was going on with the story and the voice acting was terrible, but I wasn't playing for that stuff anyway. I did find the sound to be a bit disappointing, but the visuals more than made up for it. I was just in awe of what I was seeing so many times.
Obviously this game is just begging for multiple playthroughs, but I can't do that just yet because I have so much other stuff to play.