the movies leave A LOT to be desired. the prisoner of azkaban was still good, but left out some nice little plot points that wouldn't have taken long to explain.
like who wormtail, padfoot, moony, and prongs were? you know wormtail from dealing with voldemort, but what about the rest?! it's important 'cuz prongs was harrys father! it explains why his little shield thingy (i can never remember the f**king name!) is a stag. that part really bothered me.
and goblet of fire... good god, they messed that up majorly. sirius is a major part. i don't see how they can make you care that he dies in the next movie, when his meaning wasn't clear enough in GoF. oh, and they left out the little girl elf from the quidditch match in the beginning, who is a MAJOR part of the whole death mark scene, and becomes an ongoing character.
she lives in sirius' house in the OotP! and didn't the whole house elf rights activism start in GoF?
and there' only three movies left. that's not that many.