IME there are very few* jerk GMs - and I speak as an overly demanding player who tends to quit games that don't meet my excessively high standards. Just because I disagree with a guy's GMing does not make him a jerk. IME a GM typically wants the players to have a good time, and puts in a lot of effort in his/her attempt to do so. Positively saintly, in fact. 
*DeathbyDoughnut's supervisor the obvious exception!

*DeathbyDoughnut's supervisor the obvious exception!
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