Played through the Hard Rain map with some guys from Ars Community.
The level of tactics, precision and overall maturity these guys played with had me in awe. these guys were in age bracket of I think 20's - 40's, so no screaming immature chirren, or arrogant pests either. last time i had a serious co op sweat like that was in the earlier days of gatt peyoning ravenshield and even those memories cyar compare.
The overall atmosphere of that Hard Rain map just win. changing weather patterns, floods, lightning. total immersion.
This game is a winner, pure and simple. Co Op at it's finest.