This review will be short and sweet, as I've already wasted over 2 hours of my life watching this film. I'm a huge fan of Ridley Scott, and in particular 1979s Alien.
This film is a joke, the story is full of unexplained holes, characters you couldn't care less about, and laughable scenes. The one and only good thing about it is, visually it looks good. You have people these days saying "it looks great and the 3d was amazing". Who cares? It's 99% about the story and acting, and on this it's terrible.
A 33 year wait, and so so disappointed!
Check any critic review, and you'll see they agree.