Well, how interesting a character is doesn't depend entirely on voice acting. In any case, Bodahn has better voice acting than almost all the other dwarves in the game, many of whom have ridiculously obvious American accents that simply kills their believability (although the elves are even worse in this respect).
What makes Bodahn interesting to me is the fact that I can't decide if he's to be sympathised with or despised. Clearly he took Sandal in for more than altruistic reasons and follows you around so he can profit from it, but he also hints at how Sandal is like a son to him since his wife is unable to bear him a child (which to me seems to hint at her not being dwarven). He has an intriguing backstory, and I guess the two of them traveling together trying to eke out a living/profit from the chaos under the circumstances in the game rather reminds me of Mother Courage, which is really more than can be said about the other characters in the game.