Shock: Excellent ! I have tickets for Wednesday night with a group of mates so this is what I want to hear!
It did a very good job of not being overtly 'Alien' and yet there are clear links. It opens up all sorts of other questions though so be prepared for some post movie discussions.
A few things weren't awesome. I was underwhelmed with the score. The trailer was far better. The pace at times is so fast you have to really pay attention or you'll miss very important stuff. There are a ton of plot lines running which leave plot points hanging for a while. I wonder if a Directors Cut / Extended version might alleviate some of this?
In any case, go watch it, it's great entertainment.