The more I've seen it, the more it grows on me. It's pretty endearing.
Bleak. I don't remember the last time I was so disgusted and grossed out by a horror flick. This was visceral...the Ryan Reynolds scene probably disturbed me the most. If you don't mind movies like this, I'd recommend it. It's definitely in the vein of the Alien franchise.
I disliked this movie because the characters were "smart" scientists, yet they were doing the stupidest things imaginable. In fact, the alien was a lot smarter than them. But for everything I hate about it, I was still invested and curious enough to see how it ended.