Can't say I really tried the books, but the movies (I have seen about three or four of them, including the first and the last) did not impress me.The films are okay, though.
The plotting somehow manages to be both too predictable and unclear, while the characters rarely transcend the role of living props for the protagonist's all-important journey. I actually get the sense that things and people only exist in the Potterverse to the extent that it is to Harry's convenience that they do. I half expect him to at some point turn his head too fast and realize that things do not exist when he is not looking at them. Hardly anything seems to have any significance or consequence without defining itself in relation to Harry Potter, and the plot loses a lot of appeal for that reason.