What book series did you drop or get angry reading because the main character is stupid?

I've been reading Whisper and Weapon by Lynette Noni and while I found the initial premise of the book interesting, after the mystery was solved the main character started making so many dumb decisions that she's literally called out on it by the side characters in the second book, making it very slow for me to finish reading it.

Have you encountered this in fantasy series you've read where they are supposedly super smart but actually not, or are just plain dumb making it hard for you to finish reading the books?