I've watched quite a few different broadcasts since having the MLB.TV subscription.
I agree with some of what was written, but a few disagreements:
White Sox - Benetti is actually pretty good. Stoney? Ehh, he may be mailing it in some, but to me they are the best broadcast in the AL Central.
Orioles - The comment about Jim Palmer is sort of unfair... he does talk about the past some, but he's still pretty well read and up to date on today's game as well. Usually learn something from listening to him and he clearly puts in the work, which compares favorably to Jimmie P.
Diamondbacks - Don't care much for Brenly but Steve Berthiaume is way better than Shep IMO. He's come a long way since Sportscenter.
Padres - Its an interesting pairing, Orsillo is great but overall Mark Grant is a bit too much of a clown for my taste. They find themselves at times talking about anything but the game. Particularly when the Friars are losing.
Just a few thoughts, others who know otherwise may disagree.