He was a terrible acquisition, it's easy to say, now, in hindsight.
I remember he threw a few hipchecks when he arrived, like Edler, then stopped doing it. I think this hampers the crap out of some guys, when they are told not to do something they are expert at. Edler will demonstrate this, I think. I believe his game will blossom under Tortorella and he will be a crushing hitter, again.
MS is right, though. Ballard had plenty of rope and hung himself every time. I am pretty sure he was saved from being sent down by the fighting concussion, a couple of years ago. If he hadn't been injured at that juncture, I think he was AHL bound! His career would have been essentially over as an NHLer.
MS points out ( paraphrased) that Ballard could lug the puck (and gain the zone), but did not have a strategy (hockey smarts) beyond that. I think this is ill usage and was an untapped resource. Again, telling him not to do it seems to have hurt his game. Why didn't they use this to advantage and give him instructions about what to do in the opposition zone? Pass off to a Sedin, maybe?
Whatever. It didn't work out here. Let the new coach shape the defense to his liking, no matter what the cost.