A simple eye test tells you Castillo blows at calling a game. If jerking off to advanced metrics is your thing, than look at his pitch framing, he's god awful at that too. Bottom of the league awful.
He has a cannon and decent reflexes when runners try to steal. That's okay. He has an above average bat for a catcher, that's also nice. That's not the part of his game that irritates me. The most important part of his game, the part he sucks at irritates me.
I'm with CSF, deal him. There's gotta be some prospect out there in return we can hype up farther before he's played a single MLB game.