|Or perhaps not Too Stupid to Live|
This is the character you want to slap upside the head and shake until they grow a brain.
I've read a few books with this type of character recently. The most frustrating ones are those who are supposed to be smart, yet ignore all the evidence and continue to get themselves into bad situations. Most frustrating is when the book is told from the character's POV, so all the information the reader gets comes through the character, and yet they STILL ignore the facts.
In a book I just finished reading, the MC was in a situation where they needed to resolve an issue or BIG WORLD DESTROYING events would happen. There was a lot of information available to the MC (and therefore the reader), and the MC came to a conclusion (the wrong one) in what would seem like a logical way. They examined the facts and decided on a course of action. The problem was, all the facts they considered important were the ones leading them in the wrong direction. The ones that would have resulted in them making the right choice the MC only noticed in an offhand manner (maybe to create foreshadowing for the reader) and then discarded.
If you want me to believe your MC is a smart, resourceful character, don't make them only pay attention to the information leading to the wrong choice, and discarding the other information, simply to create a disaster. Obviously for the purposes of increasing tension the disaster needs to happen, but when it happens in this way it is too much showing the hand of the author, and I get too damned frustrated with the character to bother reading on to find out what horrible thing is about to happen to them (and which I now think they deserve for being so daft).
Ok... sorry. Rant over.
What pet peeves have you come across recently that have made you want to throw the book, strangle a character, or write a ranting blog post? Do you also get frustrated with supposedly-smart-but-oh-so-dumb characters?