TotalFilm has an awesome breakdown of the trailer/interview with director James Gunn:

There is no doubt that the cinematic pinnacle of my career is our cameras circling around a maniacal raccoon shooting a machine gun on the back of a living tree.

I think what really comes through in the interview is how much he loves the characters and the world they inhabit, and I think that's very important. Because I know nothing about Guardians but the trailer sold me on it completely (weird pacing aside). Also, 6 hours in a make-up chair sounds hellish.