You don't even have to get into the weeds analyzing the big stuff like plot and character and setting to criticize Harry Potter

Just in terms of writing technique, JKR is addicted to bad writing choices that are so commonly criticized they're cliches https://twitter.com/Nymphomachy/status/1310845770933972993?s=20

The Harry Potter books are full of:

- Tom Swifties (so named because of people dunking on the cheesy old Tom Swift adventure stories), where every "he said/she said" line has a colorful verb + adverb

"I have PTSD and everyone treats it as a joke," Neville whined nebbishly

- "Eye-dialect", where you conve that someone speaks English in an accent different from your own by mangling the spelling of their words like an asshole

"Ach, jus' becau' a Scots dialec' is charact'riz'd bah glo'al stops don' mean yer hafta cover m'dialogue w'apostrophes"

"Emotional punctuation", where you grossly overuse and/or misuse punctuation marks, italics, capitalization, etc.

"Harry was... so upset... he couldn't even... get through a whole sentence... even when... he wasn't talking... and it was just... the third-person narration"

And look

Lengthy monologuing isn't inherently a bad thing, there are writers who build their whole style around making that concept work

But the *massive* character filibusters she has people break into as soon as she's allowed are the kind of thing editors mock all the time

Fuck's sake her new book Troubled Blood ends with the murderer giving a THIRTY-PAGE-LONG CONFESSION of all their crimes

Just sitting there answering all the detective's questions in exhaustive detail to make sure all the plot holes are patched up