I have to agree with Kusgnos - I feel powerless, the problem is, I never feel like it gets any better. My units lose any fight they get into, my leader does the same. I've (barely) managed to defend my base a few times, but that's it. The best I've managed as a governor is buying my way into a territory using most of my money and trying to set up a business there. It was even making a small profit, but then... what? I guess I'd need to wait several ingame years to repeat the same process?
Most of the enemies can't be negotiated with anyway, unless you can cheat yourself 150,000 of the currency.
However, it is still really early in its development, so I'll keep an eye on it.
The big thing is to match your combatants to the terrain, especially on defense. ie. if it's night and a low visibility region, you probably should use a nocturnal unit, especially if it's a non-nocturnal enemy. (It's much harder to always find a match on culture, but if you can, it helps alot.) Half the time, if you defend an island or strait region, the enemy will chicken out before even crossing the water. My black ooze in a cave was fighting almost every other turn and handily won every time against even landships because of terrain.
Also on defense, remember that if you capture an enemy, another enemy will spawn within their culture to replace them. So if you have an enemy you know you can beat, it may be best to let them go because their replacement may be upgraded to something you can't beat.
On first scouting a region, always go yourself because they're no penalty if you die. Then next turn you know exactly what enemy & terrain you'd fight in an expedition, and can wisely send the right fighter this time.
But yeah, it's an interesting game with alot of potential if they could polish up the mechanics. It reminds me of a hybrid of Kings of Dragon Pass and Fallen London.