It's nice to finally find someone who shares my opinion that only the first two movies are like the books. Most people seem to love the 3rd because it was darker, but I feel that it hurt the movie franchise by abandoning the awe and wonder and going too dark too quickly, forcing the following movies to be even darker. Alfonso Cuarón is an excellent filmmaker, but I don't think that he understood the franchise or cared about consistency with Chris Columbus' vision.
I hope that this series has the same showrunners for its length and doesn't have that kind of consistency issue. I realize that it has to get dark near the end, but it should get darker gradually, not all of the sudden in the 3rd season, and I don't ever want it to be so dark that it's not fun any more. The last 4 movies, particularly, weren't much fun for me and I still haven't seen any of them a second time.