I have also quit for now after roughly 250hrs. At this point disappointment during gameplay has won over joy so I just stopped playing. For me, I'm waiting for:
1. Better kingdom structure, improved diplomacy system (war/peace/alliance).
2. Noble system overhaul (stronger ties between clans and kingdom/culture and their fiefs). More dynamic within a kingdom's nobles.
3. Solve the snowballing problem but also solve the lord respawn problem of the current easy-fix. This is also related to player executing lords problem.
4. Balance the kingdoms, Sturgia first.
5. Balance the campaign difficulty and pace. Presumably start with improving the npc lord's decision making, they are dumb in so many ways now.
I know this is a lot but these are all essential. I also want perks, want more functionality of castle, want passive-training, want improved smithing system, but these I can somewhat live without. The listed ones are so crucial that they either significantly impact the gaming experience, or heavily affect the emersion feels, and there's just no reason for me to continue playing after seeing everything the game has to offer now.
The way I see it, the problem is simple. There are so many things to fix that the devs have to use brutal cheap-fix to counter some of the problems, but this leads to more problems. I love this game but considering the way they are "improving" it now, I'd rather sit back and wait for couple of months until they have some real breakthroughs.