Robert Long summarizes problems with the burgeoning field:

[T]he uses and abuses of neuroscience are more illustrative as a story of our tendency to get ahead of ourselves. Our perennial thirst for elegant mechanisms and overarching narratives, noble in its own right, can lead us to take lazy shortcuts and place our hope in the Next Big Explanation, whether phrenology, Freud, or Freakonomics. Culture, history, and politics are complicated, confusing, and mostly boring. With the recent successes of neuroscience, it’s easy to wish that the chatter of narratives, prejudices, habits, and emotion could be replaced with the clinical pings of the fMRI machine.

Without religion or a shared culture, science has assumed a role it is not qualified to play: a judgment of the whole, not just of its relevant area of inquiry. Don’t get me wrong: science is a vital mode of human thought; it is also just part of it. History, aesthetics, prudence, morals, virtues: these it cannot understand; and when it tries to explain them, it is not wrong, so to speak. It’s just irrelevant.

Recent Dish on the neuroscience debate here and here.