I don't recall anything unusually graphic or disturbing about it, and although it's fairly bleak throughout, it's not all bleak (compared to, say, some Cold War-era "what if we launched the nukes?" movies). There are a couple brief shots that specifically evoke Abu Ghraib torture, but it's only in passing. Nothing as direct as what's in Zero Dark Thirty, for instance, which itself is pretty far from torture porn/body horror stuff like Hostel or Saw.

Not a light movie, but definitely recommended.