Uncharted 3 Coop Adventure on Crushing is ultra hard, especially the air-port. Beating it once is quite an accomplishment, but the treasure drop rate is completely broken. You get treasures for hard on crushing - all the time. It's like 1 or 2% chance or something. Totally broken and they don't fix it. It's not fun doing the same over and over especially on Crushing - it's a nightmare to get competent players - just to get a small chance to get some virtual treasure. One of those trophies requires you to get all treasures, which is insane by itself. If the drop rate wasn't that small, it would be fine - but the drop rate even seems to decrease for the last few missing treasures. Content-wise most of the DLC are maps from Uncharted 2 + the stupid trophies and a few skins - that's basically it.