Fielding Bible has Callaspo as the sixth best fielding third-basemen in baseball.
His WAR is solid. He's a nice player. He's not a player you hold a position for, he's not a player you consider a strength.
Unlike Bourjos and Trumbo, he's not a player with a great deal of upside, but he could end up being more valuable than both.
I don't understand the dislike for the guy. I'm glad we have him. That said, when someone better comes along, I'm ready to replace him.
So far that's no one. Hopefully Cowart in a couple of years.