Great CG & Great Cinematography. Some great acting (especially David and Dr Shaw)
3D effect was subtle and very well done (I didn't hate the 3D! Woo!)
Story.. there were some holes. The plot falls flat every now and then. People's behaviour isn't logical, and the illogical parts aren't explained (some intentionally, it forms part of the theme and the story and the questions, but some just don't make sense). The last minute of the movie is a WTF almost-retcon to make it fit into the Alien universe.
So yeah, it was definitely entertaining.. but I wouldn't say it was epic.
It's worth watching once.
(PS: there's nothing after the credits.)