The film was billed as a Sci-fi monster movie, which overall it is. But it is a bit European in it's approach, often reminding me of the filming style of "28 days later", which I also enjoyed.
The character development I enjoyed overall, though it is a bit uneven...
The story itself is believable and the atmosphere it creates with the scenes of the aftermath of the aliens does a very good job of conveying the state of the world.
As far as the aliens themselves go, I feel they were very well done, but a bit underexplained, One has to spend a bit of time thinking to understand their motivations, and why they show up where they do, which depending on how you like your movies may or may not be a positive. Personally, I like the movies that leave to think a little after seeing them.
One part of the filming style that I really enjoyed, and this is a *major* spoiler...
Overall: I'd say that if you're a fan of "28 days later" this may be a movie for you. My personal rating is 3.5/5. I'd go 4 if it weren't for the uneven character development.
I have to say, I *really* enjoyed the ability to see it before it even hit theaters. While there was a premium for it, roughly $10 (1200 points), I didn't mind paying the extra for it. To my thinking, it was cheaper than a trip to the theater given I'd need a date, and I ended up seeing a movie I otherwise likely wouldn't have seen in a theater.