Honestly, after being introduced to shortcut to "group/ungroup all" I think I can deal with the system. However, it needs to work properly - better then it does not, and better then it ever did in D:OS1&2
1) Followers fail to follow you. The get lost stuck, ladders confuse them (even if laders themselves don't bug the hell out). So often I find myself having to herd everyone on by one, and current system just makes it very tedious to do so. 2) overall unresponsivenent. It seems that I can't switch between characters, or issue new orders while the old one is still happening. Is it some kind of leftover of turn based system? I remember same happening in D:OS2 - you tell someone to buff and need to wait for him/her to finish before you can switch to another character. Order someone to jump and you need for them to finish stomping before you can switch to the second character. 3) action cueing? I think it is similar problem to the previous one, but for example, if character starts climbing the ladder I can't succesfully tell him where to go next after he finishes. 4) some annoying order cancelling. I tell character to move to a position and then hover over enemies to see what my chances to hit are - nah, can't do that, character will stop.
I am sure there is more. And of course, many of those would be fixed by "traditional" system. Being able to tell everyone where to go and what to do, instead of AI having to read my throughs (and failing miserable). Pathfinding is bad, but I heard it is a difficult thing to do, so I will give Larian more time on that one.
I have little hope for Larian to rewrite movement and party control system for something more sensible, but they really need to make, what they have easier to interact with. Shouldn't basics like that be solved during vertical slice? One thing I hear over and over again, when hearing about game making is that basics like movement are one of the first things devs need to figure out - aka. if it's not fun to more around, you can't build on that. I worry that Larian is building a lot on shoddy foundations, and there is no way back without demolishing a lot of their work.