I want to add that the group control is good for like, 80% of the time.
But as soon as you come across an obstacle to jump, an area where you want to sneak, or if you simply want one character to leave the group, it becomes clunky as hell.
3/4 of the time, when I want to drag a portrait to separate a party member from the group, it doesn't work, and I have to try it 2/3 times before it actually does. Same thing to "regroup". If I'm sneaking and I forget just one guy, or I go too fast and it doesn't work, my entire party gets busted.
In short: when there's nothing to do, all is good. As a mechanic, though? It's just plain bad. Just bad.