I've been watching these all weekend, and was reminded of something that really bugged me in the last one. Just before the Dursleys have to leave Little Whinging, Petunia says she knows what "they're capable of." That Harry didn't just lose a mother that day, she lost a sister as well. It just seems so hypocritical for her to suddenly care that she lost a sister -- she let Aunt Marjorie go on and on about what a bad mother Harry must have had, after all, and is so embarrassed by her freak sister.
Also, every time I see/read The Deathly Hallows, I always wonder if the Dursleys ever returned to #4 Privet Drive and if Hermione could or did un-obliviate her parents. I suspect they would have been thrilled to have grandchildren.
I also believe Harry should have remained single (or possibly gotten together with Luna), and should have become the teacher of Defense of the Dark Arts at Hogwarts before eventually becoming Headmaster. Ginny should have ended up with Neville.