Perhaps we in the Boston market are spoiled by having Jerry Remy as commentator and expect everyone to be that interesting and that knowleldgeable. I think he's in a special situation, having been a player with the Sox and knowing so much about their history and organization. He also has Wally -- maybe that's his advantage.
In general, there should be no shortage of good commentators, despite the proliferation of networks and coverage. There's no shortage of blogs or bloggers (not talking here about us) who love the game, know the game, so maybe the networks should stop looking at former players (Remy excepted but Joe Morgan, Master Repeater of the Obvious, included) for color commentary, or start picking players who have something interesting to say and who have brains not just names.