In old Army of Two there was visual hint when in high-aggro and low-aggro, there was tough decisions to make and bounty-contracts to complete. These elements wasn't in new game, what was biggest setback in my opinion. Killing fast and killing more just isn't enough to be main feature, and levels could be more interesting than narrow tunnels through warehouses and slums.
If you liked old Army a lot, maybe its just best to pass this one and remember series as it was, in old good times. For anyone else, this is generic arcade shooter, even so great fun to play with friend.