Over the years I've lived by a simple rule: any Halloween film (except for Halloween 3 ) that doesn't feature Jamie Lee Curtis sucks and any Halloween film that kills off a character played by Jamie Lee Curtis is ok up until that point but then quickly turns to crap after that character's death.
Over the last few months I've been slowly working my way through the various classic horror movie franchises and it was probably the Halloween series that I thought I'd enjoy the least based on my one simple rule but when it came to rewatching Halloween IV: The Return of Micheal Myers I found that I actually enjoyed the movie, it's certainly no classic like John Carpenter's original film but I had fun.