The film making skills necessary to take on Michael Moore were evident in the trailer. So, if the guy who's making the movie is the one who cut the trailer together (And produced the footage) he's as good as Michael Moore is (or probably better. Columbine was extremely poorly edited.)
Seriously.
Whether he can get the content, get the interviews, and get a cohesive story out of it, is another question. Having gotten Penn on film, I think he'll do good getting interviews, even if he never does interview Moore.
I don't know the guy from adam, but I have studied film some and I'd say based on the trailer, he's got the talent to produce a quality product on a low budget. For a documentary, the risk is whether he'll get enough entertaining stuff on film, and I think he's plowing a very fertile field--- Moore has a lot of people who he's misquoted who would be happy to correct the errors, and Moore has been so pompus that the public is ready to see him taken down a notch.
I think this film has good prospects if it can get enough budget, or if he can control costs enough to get everything shot (Which should be easy since he's shooting on video... biggest expense is likely travel.)
Don