Calling a book "Slop" is pretty strong, I have only heard a few people who didn't like it and they admitted that the books were just a little to juvenile for them.
I can't say I have read any of the HP series, and I have heard everything from "Slop" to "Great", my sister in law loves them. As long as it is better than the Twilight Series of which I have read 1/2 of the first book and I really did find it difficult to read. I wouldn't call it crap though, I have read worse and it just wasn't my kind of read, hence why I have yet to read any HP
