I think the worst infield has to be Houston.
Pirates defensively should be okay outside of Castillo on second. Castillo will bat around 250, Sanchez around 270/280, I doubt any higher. LaRoche is very good but I doubt he provides that "lefty power bat" to go with Bay.
I don't think Cincinnati is gonna be too good either. Outside of Phillips and Gonzo, I really dont see "gold glove" now anywhere. EdE will get better, but that still leaves a hole at first. Not to mention the LOVELY teddy bear of a catcher we have, does he avoid getting hit this year again?
On the topic of infields but offtopic with the AL, I think Clevelands infield minus Peralta could be very nice. Garko/Blake, Barfield, Peralta and Marte/Blake with Hector Luna as a reserve? Could be very good.