Quite simply, not as good as the other two. Although there is no link to any of the three films, the fact that Lucio Fulci had no hand in this chapter means there is something missing. The first is highly overrated, the second slightly better. Unfortunately, the third is indeed third.
The main problem is that it has Americanized, dodgy 80's American rock music, the lack of suspense and poor direction. The majority of the zombies seem to be little guys dressed in black who preform more like ninjas than the walking dead. They literally leap around, and, look closely, and you can even spot a pair of underpants pushing out the top of on zombies trousers!
The plot is a little better than some of these films, but not a great deal. There is a huge lack of detail and continuality. This is by no means the worst zombie film around, there are a few good gory scenes, but you may find yourself fast forwarding to the 'good' bits as the rest is so mundane.