I completely get where you are coming from, and agree with a lot of what you have to say. They seem to becoming more and more curmudgeon as time goes on, but at the same time, I try to put things in their perspective as much as I can.
I was also surprised by how most of them thought the Sony presser was a let down:
Most of them are industry vets that are used to going to a "press" conference to get information that they couldn't get anywhere else. That obviously is less and less the case with each E3, and Sony kind of embodies that. I love it as a gamer, but as someone from the press, watching trailer after trailer provides no value to them. As Jeff has said many times since, they might as well just provide an ftp address with the trailers and save everyone the trouble. What "the press" wants are industry insights, plans for the future, and pitches that they can't get anywhere else so that they can go back and write/podcast/videocast about it. That is generally what the mass media wants the least though, because it just sounds like empty promises. E3 is continually trying to walk the lines between satisfying the press and satisfying the mass market, but as time goes on, they are focusing much more on the consumer, and I think the industry vets are feeling less and less relevant, understandably so.
Ok, that's enough of my psychoanalysis on the GB staff, I just think sometimes you have to view things from a different perspective to understand the reactions and motivations that are different than yours. Sony was super exciting to watch as a consumer, but as someone from the press, I can see how it felt empty.