I enjoyed Prometheus. Visual effects were sensational, atmosphere was deeply immersing and I felt the character portayals were quite good. The screenplay was lacking though, which some of the actors suffered on.
I wasn't satisfied with the whole (spoiler) "ah so that's the origin of the Aliens" thing though. Regardless, I give it a 4/5.
Vickers and David are portrayed as cold, calculating assholes. No offence, but I don't see how anyone could relate to those characters.