If I believed JK Rowling had done what you say she has done, I would agree with you. However, as far as being a freak goes- I feel that your list is incomplete. Neville, the shy boy with the insane parents, is in no way a freak? I'd say he is, and he's far from harmless. Kreacher's a freak, and he's not dead. If Dumbledore is a freak for being a genius, why, then so's Hermione. She lived. The twins, at school, had an almost celebrity-level of popularity, and that was because of their behavior, not because they were twins. They are not freaks- or if they are, then so are Padma and Parvati, who lived through the book.

No, the book didn't show any homosexual relationships. How many pieces of mainstream fiction do? Do you expect them to? I'm disappointed that they don't, but I find it ridiculous to claim that every book that does not contains deliberate prejudice and should be different.

On the topic of Kreacher, I think you're right on. I've got absolutely no issue with that.