I've been playing this game for the past few days and noticed a couple of (what I would consider to be) major problems with the co-op experience.
Problem 1:
The first problem is a simple one, and is more frustrating than it is a bug or anything. Any time I join a coop session, I start with the amount of ammo I'd get from having my default ammo pouches. The problem with this is that I'm usually forced to spend something around 200,000 rupees just to stock up on ammunition. If one of us desyncs, I'm forced to do it again. Suffice it to say, I don't really see co-op benefiting from being some sort of forced money pit for anyone who joins. There's really no reason to force players to rebuy ammunition they already got during their solo play. This information is saved between single player sessions, so I REALLY don't understand why this can't be saved over online sessions (meaning that ammo is carried over from singleplayer to multiplayer). I also ran into a small bug when buying ammunition where it wanted me to purchase 400 arrows (obviously much larger than the maximum capacity of any quiver):
Related image: https://dl.dropboxusercontent.com/s/...43-19.png?dl=0
Problem 2:
The next problem is a bit more frustrating. It's basically just the fact that I appear to do little to no damage with sniper rifles in co-op (as the person connecting to the other player, not the host). The Z93, for example, can usually kill most animals with one shot (including tigers/bears/yaks/etc). I, for some reason, when using this weapon, am not able to do this. Usually it takes me three shots to kill any of these animals. Normally I would've considered this to be some sort of hit detection issue, but I've noticed that the number of shots it takes to kill anything is consistent. For example, it always takes 3 shots with tigers, bears, and yaks. It also doesn't seem to kill heavy units with one shot to the head as it usually does in singleplayer. The host of the server, however, is able to kill these animals in one shot, and is able to kill heavy units in one shot to the head. Just to give you an idea of what I'm talking about, I recorded a short mp4 of me taking 3 shots to kill a tiger with a non-suppressed Z93:
https://dl.dropboxusercontent.com/s/...34-45.mp4?dl=0
This problem doesn't seem to occur with arrows. I haven't really tested many other guns to see if they have the same issues. Rockets always work, arrows always work, and they always do the correct amount of damage (as far as I can tell).