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

Go in cold, and you're likely to emerge with your blood boiling. This has to be seen to be believed.

The movie is made so realistic it has a lot of that WoW feeling at the right moments and never tooo over the top. the suspense is done so well and the emotion is felt. Very well put together with the music and all.

While it is a pity that the story wasn't told with more visual finesse, this is trivial compared to our real-world problems. It takes a good movie to put that into perspective.