This game is a half finished piece of crap. No Joke! I will never preorder a total war game again.
The diplomacy and internal politics which I was also looking forward to in this game have turned out to be a complete flop. Interal politics is not explained very well at all. As such, I have completely ignored internal politics and it really has had little impact on the game party because it is just so bland. Diplomacy is also horrible because of how bad the campaign AI is. Even when you provide a mutually beneficial agreement with the AI, the AI will completely reject it, such as a trade agreement with a neutral or even friendly faction.
On top of all of this, the game is littered with bugs and glitches making it almost unplayable. This game is a complete disgrace! For any one thinking about buying it. I would wait for at least 6 months until they actually flesh out all of the bugs and make some improvements to the AI, hopefully. They will most likely fix many of the bugs, but if they don't make substantial improvements to the AI and UI to the game I wouldn't even bother buying this game again even without the bugs and glitches.