First and foremost for people that have seen the trailers - these scenes are pretty much all the cool scenes in the movie, and they're actually more boring in the context of the movie than they are in the trailers.
I think the script was written by a CSI or Chuck writer, because instead of character development through natural dialogue, you get one-dimensional, similar, and explanatory-sounding language coming from different characters that explain the events to you rather than show you.
The concept of sharing lucid dreams is great and all, but I wish there had been SOME logical explanation or back-story about how it all came to be - i.e., basing this concept on something in reality (even if implausible). And the "dream rules" seem arbitrary and not really realistic (at least in my dream experience). Specifically, their dreams are much too concrete and laws-of-physics-behaving (in general), and not dream-like at all.