Prisoners is a largely generic revenge / suspense / mystery "they have my kid" tale with a predictable plot that gives itself away too early. No attempt at realism, this is Scooby-Doo style investigation - lie detectors are treated seriously, "bad guys" are largely 1-dimensional with poorly explained motives designed to surprise rather than give insight, etc.

It tries to make up for this in a few ways: a) bump up the intensity of scenes (comes across forced and awkward), b) add extra violence and dark semi-religious symbolism (seems out of place and largely meaningless), and most importantly... أقرأ الباقي.