OK - a few for me off the top of my head:
--I never really liked Go very much, although it almost seems to be a favorite for many people here
--I never cared for the '69-78 version of the To Tell the Truth theme, I find it annoying
--I never really cared for Gene Wood as an announcer
Also, as a general rule my tastes are a bit different than the norm: my favorite game shows of all time would probably be Press Your Luck, Celebrity Sweepstakes, Break the Bank '76, Whew, and probably "classic" WWTBAM. Most other people would probably rank Password, Pyramid, To Tell the Truth, Match Game and Price is Right at the top of their lists. I'd rank those shows high on my lists too, but a lot lower than many others would.