I'm tempted to rebuy DA:O to get the ultimate edition with all the dlc
The Stone Prisoner DLC was pretty good but that was available if you got the DDE version. It was properly integrated with the game with lots of dialogue/banter between the other chars.
I tried Return to Ostagar. One of the after release DLC and it was truly abysmal. No dialogue, basically no new enemies or areas and nothing even remotely challenging. So I wouldn't expect much from anything else they put out after release either.