1 vs 100 was great. It was one of those new things they were trying at the time, and it gave many people a chance to win real prizes. The cool thing about it, was that 1 person would randomly be chosen to be the 1 who versus the 100. I never got picked, but it was still a fun trivia game to play.
I wish they would have brought it back already. There was rumors they were bringing it back at some point, but so far it's hasn't come to fruition yet.
It would be nice if Xbox tried to replicate this by doing more live game events. Could be a fun way to drum up activity on your platforms.