If you're a hard boiled detective genre fan, all the complaints about True Detective's ending are pretty laughable
I just finished my 5th or 6th hardboiled detective novel (The Big Nowhere), and I've seen some movies in the hardboiled vein as well. A lot of people consider True Detective's ending too ambiguous and unsatisfying because it didn't wrap everything up neatly. After hearing all the complaints about the ambiguity but without spoiling the details of the ending, I went into the show not even expecting to come out knowing the killer's identity. Instead, I just got a typical hardboiled detective ending.
** TRUE DETECTIVE SPOILERS**
The complainers should count themselves lucky the good guys both survived with little personal cost to themselves besides emotional hardship. And as for the Tuttle family getting away with it, yep, that's typical for hardboiled detective fiction. The powerful always get away with it. Welcome to the genre guys. Also, I'm sorry everyone spent 7 weeks over analyzing all the scenes in an attempt to determine the killer's identity. The important part was the character development of Marty and Rust not the King in Yellow. He's just your typical weirdo psycho hardboiled villain.