mm there's threads that pop up from time to time about d9 on /tv/ at 4chan.org.
io9.com has a few blog posts with some discussions, and imdb.com and to a lesser extent rottentomatoes.com.
an example of some threads:
I personally feel that what people identify as 'plotholes' in this movie either weren't listening when people were talking or didn't read between the lines using the other information provided by the movie.