CK2 with shattered retreat and coalitions is a bit retarded, but playable. Using conclave is out of the question looking how severely it affects the quality of CK2.
I have to agree with it even if the shattered retreat isn't that much an issue for me except for rebels or any landless army.
The coalition only has this issue that at some point doing very small things cause a huge burst in threat.
What seems to be broken is all the council things and the poor amont of leverage available.
In my case, the council allowed me to go on a holy war but then refuse that I grant title to anyone. Have fun being a tyran when all you want to do is to give land to anyone after your kingdom got it back or suffer the over the limit effect...
I really thing that there should also be some group proposal for the council : I do this, this and that, do you accept.
Like in my case, I have 3 titles to give, I give one to 3 different council member relatives. And at that point I would expect the 3 council members to say that they agree. It's only logical.
And also, I was under the impression that the middle age was more directed in the opposite way : high council power fading away to a more centralized state.
But currently we have the opposite : the king decide everything until the vassals force more rights to the council and more and more...