Lack of good storyline.

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

The film creates a perfect balance between action and depth of basic needs, in the midst of an infertile atmosphere.

Just intense enough to provide a much-needed diversion, just lightweight enough to make you forget about it soon after it’s over. It’s not exactly “good,” per se, but it does what it sets out to do in terms of putting us on edge, which makes it … successful?