I don't really like or watch the anime. I might watch an episode if something actually happens, or features a Pokemon I really like.
Would it be nice if the movies were actually built off events that happened in the show? Yeah. The Pokemon movies don't really appeal to people who don't follow the show. However, the Pokemon series itself rarely references previous continuity, and why should the movies be any different.
The major problems with the movies, especially the early ones, is the production. The first few movies look like crap. And while opinions may vary on if the writing, voice acting, etc... is still good, the animation itself has vastly improved.