Does J Street Spend Too Much Time Criticizing Others?

Goldblog Reader Adam Block emails in:

"I wanted to be supportive of J-Street when it came out, but it seems to me that most of their activity has been wasted on just criticizing other people (however wrongheaded they may be) who are advocating for Israel, and relatively little seems to be spent on building support for another set of ideas." 

Block goes on to say that, though the 15-months-old J Street has become increasingly influential, its attention-seeking, hyper-critical approach "only makes sense if you think that the biggest problem facing Israel is overzealous advocacy by right-wingers, and while that's a logically feasible position to take, I just don't see how someone could say that's the biggest issue facing the country."