Bug: Sometimes doors appear to be closed when they are actually open in COOP. You can walk through "open" doors but you cannot see through them, making clearing rooms very difficult and dangerous. I have been killed by bots on many occasions because of this bug. Rejoining server fixes it.
Gameplay request: It would be nice if you could toggle a gameplay setting to make it so when you take a grenade/molotov off the ground it would add it to your inventory instead of equipping it there and then.
Weapon request: P90 and the ability to mount bayonets onto certain rifles would be nice