As far as horror sequels go, Halloween II is a success in its own right. After a near-perfect film like Halloween, expectations for Halloween II were extremely high. Even though it isn't at the level of its predecessor, it's still not a bad film. However, it's a very simple and focused film. It retains the thrilling atmosphere of Halloween, yes, but it also forgets why Halloween even happened. Halloween II feels almost pointless.
The movie's motive is forgotten. It will still entertain and scare, but that's only because it doesn't try to be as good as its predecessor. Halloween II was trying to be an okay sequel to a masterpiece of a movie, and it succeeds in doing that. Ultimately, Halloween II achieves its goal of not being a total failure, but sadly never attempts to reach the height of Halloween.