It's pretty awkward for maybe the first half, with the story moving too fast, falling short in developing atmosphere and characters. But it's actually when the plot starts to stretch credibility that it actually gets to be a lot of fun, particularly with a number of inventive nightmare sequences. Has its flaws, but in some ways one of Wes Craven's more satisfying films.
The initial sequence was quite suppressing, but after 10 minutes the film lose completely the rhythm. Became a lame love story zombies (I need to be fair, on the graveyard scene for a few seconds it reminds me of "I walk with a zonbie"), and you need to wait almost until the end to have another good scene in the coffin. Regret that I don't like the film formally, I like the political (zombies under a fascist regime)
The film fails in what is the most important thing in horror films, to build up tension and eerie/creepy/otherwordly atmosphere, because Craven just rushes from one scene to another. In the latter half, the combination of secret police and voodoo manages to give a sinister feel to the film and a peek to the dark side of humanity but then comes the ending which is a farce that highlights all the faults of the movie.