The first hour or so was momentarily almost dreadfully dull, but luckily things became more interesting towards the end as he really started to contemplate his doings.
More than anything else, I think this film spoofs pretentious film directors who only like to make artsy-fartsy documentaries where they deal with more or less deep subject matters (being a zombie) through what they consider to be really thought-provoking means (gay porn).
Don't despair during the first half an hour, the film becomes much clearer towards the end.