Could someone give me some details of Hanigan's defense & pitch calling skills?

I see us carrying 3 catchers. All of whom are substandard (even with Bako playing above his norm...for now). Why is Hanigan not up with the big club? He's hitting at .324 and he also hits from the right side. Two things this club needs rather desperately right now. Average and righties.

Is his defense that porous? Does he call that poor of a game? Is his arm a limp noodle? I just don't get it.