I never understood what the hype was about. I read the books recently when I'm an adult and saw the movies many times when I was a child. I have several reasons why I think Harry Potter is overrated.:
First of all, Rowling didn't do anything special.
Witchcraft schools existed before, also the magical style that seems to be copied mainly from Disney especially Mary Poppins, the part of "the chosen one" and the "hero's journey" is also a part that is in many stories, (the story of a boy who is chosen lives with his uncles and has another identity and lives a normal life is very reminiscent of Spider-Man, but Spider-Man is more original and iconic), part of a coming-of-age story and concepts of "adults" (things like racism) were also Exist before in series, movies and stories. So what has Harry Potter been up to?
Another thing, the plot doesn't feel as complex, realistic, or interesting as it tries to be. The writing is often predictable and ends poorl and in the end nothing happens. When something interesting happens it's only at the end of the book, and even then it doesn't lead to anything.
Most of the content in all these books is boring. There are things in there that I didn't really care for, and forced myself to keep listening.
There are also problems of plot holes, or things that did not develop well and all kinds or didn't make sense. There were more writing problems.
The characters are not good. Many of the characters were particularly unlikable, but people keep saying they like them, and want to see more of them (for example James Potter and Sirius Black), (by the way, their story is also not very original).
Also, Most of the characters have exactly the same personality, the teachers and the students they all kind and brave, even tho it's different people..
The only ones who were different from the other characters were students from Slytherin, but also for some reason everyone who studied in Slytherin was bad person (Rowling teaches a lesson about racism and then decides to generalize people, like all snobs are blonde with blue eyes).
Harry is also not a good character, the only difference from Voldemort is that he had loving mom so how he is a hero? He is too mediocre and there is nothing special about him. He may be talented, but many times he doesn't seem special and he also fails a lot. Besides he has no character, he's just sometimes nice and sometimes sassy, but somehow he is iconic.
There is also no point to books if people read it at a different age to their audience. If someone older (like me) reads the first book they will just think it's too boring and childish..
Another downside is that the first book was too boring and childish, at least for me.
*Note: This is my honest opinion, I hope I didn't hurt anyone and I hope you don't feel negative feelings about it.