What was the worst one-shot you have ever played or GMed? What went wrong and what lesson(s) did you learn from the experience?
I played in a con game where the character creation for a dozen people lasted over 3 hours. I didn’t like that, even though the game was OK. I believe that it would be hard for a game to generate so much excitement that waiting for 3 hours would work for me.
Maybe that works for a six hour slot, but I don’t think so because it wasn’t ‘play’, it was sitting around. In a shorter slot, I’ve seen folks get an hour of play because of character creation using most of the slot. Ugh.