The_Mask
Just like Yves, I chase tales.
At the start of the game, the difference between +3 and, say, +5 is not really a big deal. And by the end of the game, you can make up the stats. There are also kingdom... things... that can help with that problem.If you want to maximize your Regent you need maximum charisma, not a modicum. There's no other class that would be maximizing Charisma aside from Sorcerer/Bard (awful for already stated reasons of spell progression not stacking). If you are just leaving their stats at +2 charisma bonus rather than leveling to +7-10 then its still an awful choice to have them in the regent slot.
Believe that the weaknesses of this game are not in this.
But, your instincts are right, I guess. Most of my playthroughs have had an NPC as a regent.