I agree with portions of what most of you have said, thus far. The MBTA has elements of both good and bad, as the fact that the Boston area at least has service, as compared to San Antonio, etc.
However, I don't think that the battle should be "East vs. West", rather I think it would be better if a unified effort should be pursued. After all, the highway lobbies are united. That's why they are strong. As you all know, a contiguous rail system is one that's the most viable. Perhaps the Cape Cod Rail Advocates could join forces with the Fall River-New bedford group, and so on.
An example of this is a while back when the Danbury and Waterbury branches of the MN commuter rail in Connecticut were threatened with closure. For a while there was the "my branch is more important than yours" scenario until someone suggested that the local citizens' groups join forces, and fight for both lines. The result was that both lines were not only saved but are also on the state's long-range plans for expansion at some point.
As long as an advocacy group is assertive and respectful of others' goals, that's when it's most effective,IMHO
If Boston to Cape Cod rail service occurs in 2012 I will eat a jelly doughnut dipped in tomato sauce.