Well, *I* didn't think it was an incoherent mess. In my opinion it actually follows the book fairly closely; it's hard for me to see what Alan Moore is so upset about, other than his personal blood feud with DC. The only really startling omission I noticed is that the movie rather downplays the book's implication that Evey is the new V (and the cop the new Evey). (It also steals one of the prominent closing shots pretty flagrantly from Fight Club, for what it's worth.)

The Shadow Galaxy shrine is still the best V for Vendetta site on the Web. Do all your V reading there.