Character control gets easier once you get used to it. There were party selection and screen recentre hotkeys added after the demo was created, which addressed the issues I had with that.
For the most part you can direct both character to attack and move as one.
If you make the secondary character an archer and set them to aggressive, they will attack on their own, and you will mostly only need to manually select targets, or have them move or use a potion, for tough fights. I started with a warrior / warrior combination, with one character switching to archery for strong opponents. Towards the end of the first act, when arrows became more plentiful (with the
patch they are cheaper and you can buy as many as you want in the BF) and I got out of areas with lots of skeletons (much more vulnerable to crushing damage from a club or walking stick), I switched full time to a warrior / archer combination.
If you just found the party controls unfamiliar, a bit annoying and/or selection hotkeys would help, then it would probably be worth it to buy the game (especially since it is relatively cheap now). If you hate party based games in general, or thought the demo was a PITA, then it would probably not be.
Try going through the demo again. If the controls aren't so bad and a hotkey to more quickly and easily select all characters would save a lot of aggravation, then get BD. If the controls start annoying you more than before and you wouldn't bring yourself to finish the demo again on a bet, then skip BD and wait for DD2.
