Well the problem with Madora and Jahan is that their quests are very simplistic, or if they can be even considered quests (a la Cyseal level) rather than just flavor quests. No choices to make with them. Now of course flavor text to some degree better than non-flavor-text henchmen. But I wouldn't (didn't) play with them in a second run. Gameplay wise (which in my subjective definition include C&C and whatnot) they make no difference.

The new ones I haven't played yet. We'll see.