I don't think that's a fair analysis of the characters as the story progresses (except maybe for Ron, but who likes Ron anyway?) How far into HPMOR did you get?
I have my issues with the rest of the series, but I really liked the part where Ron says "if you are a friend of Malfoy, you can't be my friend" and Harry tells him to go pound sand. It's just a horrible thing for the supposed heroes of the original book to roll along with.
You could argue that the original JKR work also portrays Dumbledore in a somewhat unflattering light. (He sent children after known dark wizards on multiple occasions, lied to Harry on several occasions, arguably stood by while Sirius was sentenced, etc.) As readers, we like Dumbledore, but he is hardly a paragon of virtue. I rather enjoy how MOR spins that.
Yeah, I did not like that one either. Though claiming that Dumbledore is portrayed as a "drooling moron" there (or anywhere else for the matter) is not precisely correct.
Read on. Dumbledore is clearly one of the smartest characters in the book, not a drooling moron at all. He puts on a pretence of being completely bonkers to confuse his enemies, but he's very smart and thinks fifteen steps ahead (just one short of Harry...) and is one of the few characters in the book who's an Agent rather than an NPC.
As for the other characters, their level of agency varies, but at the very least Quirrel, Hermione and Draco are also agents (i.e. smart enough to be capable of driving the story in a meaningful way), and the other characters are portrayed fairly accurately given their stupidity in the original books.
In the original book, ALL the characters are stupid. In HP:MoR, 5 characters are not stupid. I think that's an improvement.
