Not having any interaction with the commanders siblings, the raven not showing up in battles and the shortness of most of the characters arcs were all disappointments for me.
Also not meeting anyone besides the crew of the raven in general made me feel like that's all my empire consisted of, I also missed all the little touches to the over-world map in the total war series ie having generals that grow and develop based on there performance in battle and agents to use the kind of thing that lends itself really well to an evolving story entirely driven by the players actions.
The games strength, the conversations aboard the raven peter out to nothing after around the 40th turn too which makes the actual gameplay's flaws all the more obvious without the ability even to lead each battle personally.
The lack of any diplomacy...I could go on, functional but disappointing describes great swaths of the game for me. Pretty close to my exp so far with the divinity series really, hopefully OS will redeem it.