If you are wondering when in the hell Michael Meyers is going to make an appearance in Halloween 3, you'll be waiting for a very long time. There is a quick shot of his looming presence on a TV set in the film and that's it. Halloween 3 is really not an end to a trilogy but a whole new story. This makes people either love it or hate it. I fall somewhere in-between.
H3 has several things going for it. 1) The story is interesting and has a few surprises along the way. I have watched H3 many times and never get tired of it. 2) John Carpenter supplies a creepy soundtrack which greatly adds to the feel of the film. This includes the nerve-wrecking Silver Shamrock Jingle that taunts its listeners throughout the film. 3) Tom Atkins [The Fog, Escape From New York] gives a strong performance as Daniel Challis, a doctor who suspects that something fishy is happening over at the Silver Shamrock plant. This movie would be in trouble without him.
Now for the negatives: 1) Toward the end of the film there's some utter BS abut Samhain and witchcraft that is not only pure fiction but it has little to do with the rest of the film. It's not needed at all. 2) Some of the special effects are a bit laughable. They pale in comparison to some of Carpenter's other masterpieces such as The Thing. 3) Carpenter gives the director's and writer's tasks to Tommy Lee Wallace [It, Fright Night 2] who does a decent job but he's no John Carpenter. The same thing happened to Wes Craven in the Nightmare on Elm street franchise. The best of those films [the Original and A New Nightmare] were the ones where Craven had control of the project.
So, don't believe the haters. It's really a decent film if you haven't seen it. Just remember that it's not a sequel to the original. It's a totally different beast. Happy, happy Halloween!
For more info check out the film's entry in IMDB.