I definitely like the DD storyline...and would love, love, LOVE to see bits of it in any new game...(especially my little grey kitty!)
As for controlling one or more henchman....I find that one or two (if done properly (NWN - HoTU, for example), not only help in combat, but make the story of the game deliciously immersive...done poorly (anytime you have to take someone along in Oblivion) you'll do anything to avoid it...
