Oh, Jesus, the DP is the guy who shoots Kitchen Nightmares and other reality television shows. This explains everything.
You may think it looks like crap, but word from the Toronto and Glasgow and SXSW film festivals is that both critics and film-goers alike (keep in mind that many of the attendees at these festivals are filmmakers themselves) are raving about the look of the film.
As to cinematographer Jay Hunter working on "reality" shows: Like most everyone actually in the industry, Whedon's cinematographer goes where the work is. Not all the projects he's worked on are going to give him a chance to shine.
That the man has worked on a number of reality television shows explains nothing at at all, save that he's good enough to regularly find work in an industry where most people don't find steady employment.