Imo the best thing about Prometheus are the following 4 things, in the this order
1. Ridley Scott and Giger at helm
2. Use of practical sets as much as possible, CGI limited considerably
3. An apparent consistency with the designs from Alien, the alien bone corridors, the Ron Cobbesque designs of the vehicles
4. 3D - to experience Scott's hypersensitive Gothic, moody horror in 3D must be really something