Harry Potter 1=Harry Potter 2>Harry Potter 3>Harry Potter 4>Harry Potter 7 pt 1 & 2> Harry Potter 5>>Harry Potter 6.
Now to be fair to HP6 the lady they got to be Umbridge was PERFECT so there was no doubt on the antagonist. However, there were still problems, for one the fact that Hagrid's half-brother didn't have ANY lines during the film as well as having the worst cg design EVER. They also never explain what "Half blood Prince" meant like they did in the book. And of course, Dumbledore's lame ass death scene. It was just utterly MEH, probably the most boring death scene I have ever seen on cinema.
One qualm I have with the film series as a whole is how Dobby was only in two FREAKIN' movies when in the books he was an important character through-out the series albeit having sporadic apearances. Also when he returns in movie 7, he is still in his rags even though after a house-elf is set free from their human masters they can dress however they want to and in the books he dressed in nice clothes. I won't knock the movie for not going into house-elf culture, I'll admit that did not progress the story and it could've been there or not.
And why the hell was Tonks so underplayed? I'll admit she didn't do that much in the books, but she was still interesting. Her most memorable scene to me was her saying "Don't call me Nymphadora" and I can't remember her doing anything interesting. Also I thought it was annoying how her and Lupin getting together just happened in the movies, no explanation-AT ALL! I know, the whole series is CRAMMED full of romantic bull-crap but just a SMIDGE more development would've been nice.
Another character they messed up was Fenrir who was BORING! He looked and acted like the Harry Potter equivalent of Sabretooth sans memorability.
And having Harry just BREAK the elder wand? UN-UH! That wand was the most powerful fucking thing in that world, NO WAY could someone just break the damn thing.
Finally there is all the other little smid-bits that I would've liked to see but were cut out because they weren't necessarily necessary. Really I feel this series shouldn't have been turned into a movie franchise and should've been a TV franchise instead.