Pretty good movie overall. First half was nothing special but it got better as it went along.

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

It is neither dumb nor smart enough to be fun, and spends way too much time with its boring human characters.

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.