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

A great movie, one of the best of this year. There was a bit of confusion at one point in the plot, but nothing serious.

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 tone of this movie is interesting -- the stakes are both dramatic and high, but it's balanced with a lot of fun, tongue and cheek dialogue.