I only miss some kind of conclusion or summing up to support the rather low score.
I think the support of the score is the whole review. Speaking personally, if you've read the review you know (or should know, if the reviewer did their job, *cough*IGNorance*cough*) why the game got that particular score. I don't think 6/10 is particularly low, it's better than average but obviously you liked the game more.
I'd rather see some combat related DLC, than 'sim' editor though. Maybe some pretty tactics screen during combat, to organize attack, retreat, reinforcements during battle, maybe even with some fancy unit graphics. But I guess it would take to much resources to do this, so not much hope here.
I think they could do it fairly easily but it's just not what the game is aiming for. The whole approach seems to be aimed at a strategic view over a long period of time, where individual tactical battles are an irrelevance.