I don't see why you're having a problem, it's akways been that way.
+2 command will give him 2 more Command Stars, if you look at the character's profile you will see command and soem other stats next to the image (they have changed names in different games except for command, so I don't know what empires has).
AFAIK Command improves morale, and the more morale you have the better your units will fight and they are less likely to break and flee.
It seems that Empires does not show traits that used to be shown, previously for ever command rank the general went up, there would be a trait (some traits were replaced by an improved version, especially for assassin's and spies) that gives the corrisponding reason/explanation and bonus.
IE
Good Tactician = +2 command
Characters can be born/start with traits that give them bonuses, but they will mostly earn them through experiance, leading armies, battles, or governing cities (especially cities with schools and other centers of learning).
By default, management/influence/command/etc etc start off as 0 which provides no bonus, various traits and ancillaries (followers in Empires, I hope that can be renamed) are acquired and provide bonuses and improvements. More influence was useful for diplomacy and governing, and possibly to keep the troops in line. Mnagement was useful for governing cities. Command for battles, etc. In Medieval 2 Honour (or was it Chivalry?) was good for keeping people happy in cities and your troops too, whereas it's opposite was Cruelty or something (infamy? Can't remember) and lowered your opponent's morale in battle, but was not good for governing cities.