Hey, we're all entitled to our opinions...just like you clearly really enjoy the Harry Potter books, I don't and I have my own reasons for doing so. It's not because I'm trying "not to be normal". I concede that Harry potter is exceptionally popular and appeals to a lot of people. And yes, it is original. But it does not mean, just because it is widely received, that it has to appeal to every single person.
You say that the books are great because you obviously enjoy them. I, too, enjoyed the books for a while...but then, Harry started to annoy me. The plots started to annoy me. I've stated my reason for not liking the books so much anymore elsewhere in the Harry Potter forum, so I won't bore people by repeating them again.
But please, accept that people have their own tastes and opinions. I wouldn't try to dissuade you from your obvious enjoyment of the books, so please don't try to explain my dislike of the books as having bad taste or not recognising quality because that is not the reason. I would probably feel quite irrated if some badmouthed my favourite authors or books, but then it has to be accepted that people will always have differing tastes and opinions.