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

This movie was so-so. It had it's moments, but wasn't the greatest.

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.

Amazing worth wacthing. So good. Biased but well made with many good points.