Finished my first playthrough (Liu Bei in the Yellow Turbans Scenario) - Sun Jian's was by far the strongest force around, with the battles against Dong Zhuo and Yuan Shao being fairly underwhelming afterwards, in spite of Lu Bu popping up there both times and Cao Cao's crew joining Yuan Shao. Although I did get to try a few things with them, like the Kind fame command that allows unhappy territories to join the player without any battles.
Started my second playthrough in the coup/Jin scenario with Wang Yuanji. I'll probably keep her as an officer this time, rather than going for ruler like I did with Liu Bei. I'm kind of disappointed about the fall of Shu event happening so early though, way before the player even has time to conquer/pacify Wei, unlike in actual history. They should have included as a condition for the Shu invasion event Jin controlling the entire Wei territory...
What's the difference between the regular 7 and Empires version? Is Empire the definite version or something?
It's the "ultimate" version of DW7 in some ways - all movesets from past DLC, from the XL expansion and even extra new ones are here, however, it's also just plain different in many ways. The basic fighting engine is the same, but, rather than being used for a cutscene filled story mode or other preset battles, you've got it being used for the battles in a tactical game, with additions like being able to order troops around the map and employ special abilities, like calling for reinforcements or leaving traps in the field. As a result of that focus too, they've upped the power of enemy officers, although being a one man army still is possible in low difficulties or after completely powering up everything in the higher ones.
You choose a starting scenario and then can pick any characters from it, and from there attempt to conquer ancient China (or join one of the kingdoms that want to do it and help them accomplish that) with the gameplay going from management of production, support and diplomacy of the kingdom through menus (although a fairly basic one compared to the RotTK games) to the action gameplay when you participate in a battle.
This game also takes some elements from the more roleplaying focused versions of RotTKs, with the player being able to take various positions, rather than always commanding a kingdom. In my playthrough as Liu Bei in the Yellow Turbans scenario, I started as a free officer just roaming the land and helping other armies fight against the Yellow Turbans, before hiring some other characters and forming a vagabond unit. In this phase, I travelled around and found a kingdom with higher level weapons. After arming myself, I travelled somewhere else and challanged the ruler there, taking his lands after winning and finally creating a kingdom ruled by my chosen character (Liu Bei) and starting an expansion from there.