1. Its difficult to keep up with NPC dialogueEven if you are a fast reader, its difficult to keep up. When you are not the one who initiated conversation you will watch your friend interact with the NPC. The text will pop up over his head, but will fade away very quickly.
For instance, I have little to no idea what the conversation with Arhu was about when you first meet him until I went back and reread the journal.
2. Inability to see friends inventory. This is a big one as well, in Baldurs Gate multiplayer you can view other players inventories that your friend controls. It will gray out the inventory such that you cannot interact with it, but you can see it. In this game, you cannot view your friends inventory at all. Makes it a pain to figure out who has what, or if your friend may have picked up something that will help you.
These 2 issues are really making co-op much less enjoyable for us. If these could be fixed it would be much better.
On the first one, I think the reason why it is like that is because you are supposed to be able to be at two different places at once. (like one can be in the city, the other can be doing combat somewhere else).
However I would like for there to be an option that you could force both characters into a "Dialogue box" like in the old crpgs like baldurs gate etc.
The second one I semi agree on. It is both fun and frustrating to not be able to see your friends inventory. Should be a toggle there too. However i also like the idea of being able to hide what you have from your friend (for rp purposes), but I have no idea how many people who will actually do that.
I say make a toggle for both unless it is too time consuming to do.
It has been this way since alpha so not going to change anytime soon i reckon.