Bad scripts
The scenario Marty is writing is so incredibly lame and uninteresting! I know it is supposed to be a caricature or a satire, but in fact it reproduces exactly what it is suppose to destroy. I couldn't wait for those parts with the "Psychopaths" to end and felt embarrassed for Martin McDonagh. And the stories of Hans and Zack are so alike it almost feel like he had no inspiration for those characters.
Same thing with sexism. The film goes out of his way to tell us how women are badly depicted in Hollywood film, but it does exactly the same. All the women characters are called bitch or *beep* and disposable. And the prostitute that is super literate? Wow, what an industry changing idea! Same thing with the violence: hey, let make a movie that is supposed to criticize violence, but actually base all its gags on it!
Seriously, In Bruges was fun but this on takes itself way to seriously trying to be an anti-Hollywood movie while being just that. It is a *beep* of clichés. You can't have your cake and eat it...