I can't remember the name of the GS, I think it was on the Jamie Kennedy show (midnight EST on ABC Family, maybe a couple months ago). It had 3 contestants, one was not informed of the rules until the game started, and they were REALLY complicated. Maybe someone remembers what I'm talking about.
Celebrity Jeopardy on SNL....... ah, the classics. Here at college some of the outtakes are quoted even amongst those that hate game shows. It was absolutely hilarious, and is still traded around.
I haven't seen enough to make a clear judgement, but one of the ones I hated was the Bensonhurst Dating Game (with Joe Pesci playing the host).