It's entirely possible that sending the audience out feeling lousy was intentional

It's funny, it's tense, it features two great performances from two actors and the director expertly creates a web of odd tension where you actually don't know what is happening for the majority of the run time.

The best films of this genre always show a path and provide a takeaway for being a better person.

By the time the dramatic fireworks start popping off, each one feels earned.