Foolednomore: Seems like uber jwdub make the biggest assholes.
Well, that just makes them like most people. Those who are most dedicated to something will judge others as falling short of their standard. And the more fervent they are, the harder it is for them to hide it. I have to say, though, that most of the uber JWs I knew weren't MS or elders.
I don't recall any particular overseer who stood out as a jerk during my time as a JW. But there were a number of elders who definitely fit the mold. Some people will see the promotion to MS or elder as a chance to serve, and others will see it as a position of authority. The latter are often very difficult to deal with, as they tend to do the least (to help the congregation) but demand the most (deference and respect). They were usually very vain men, the sort who spent more time worrying about their hairline than about the congregation's needs.