More comments from some one who's never taken a GUE class.
One of the things I try to teach my students is that they should take an active role in picking an instructor if they want a good one. I do see lots of bad ones and I see poorly trained divers. I have had bad instructors also. How bad? I took a technical course once where the instructor never got in the water. The one time I did see him in the water he worried us because he was under weighted and I thought he was going to hurt himself. LOL
At least at their current size, I don't think you'll see this with any GUE instructor. I've dived with a couple, watched another teach and met or had dealings with a few others.
As far as the attitude, some people do seem a bit smug at times. Many of you have seen me hammer some of them on the boards, in fact. However, none of the GUE instructors I've met displayed an attitude. My advice would be that if you're interested in a GUE class, talk to an instructor. Discuss your diving goals, needs and how the class in question might help you. Then decide.