My first GM was...kind of terrible. She was dating a friend I was going to college with, who invited me to join a Firefly campaign. I'd never played a pen and paper rpg before, and I'd never seen the show, but it beat going home after class, so I joined up. None of us, excepting the creepy old guy, had ever played before so no one seemed to notice she had no idea how the game worked, and was not very good at keeping the group on track/managing problem players. She was good at making things up on the fly, but eventually the group got too big and too many experienced players joined for that to cover up the other issues. She was also pretty terrible as a player, because she still would not learn the rules to the game but was an awful spotlight hog. For those reasons and some out of game ones I'm glad she's in the rear view mirror.