And by "Bad fits", I don't mean an on-air meltdown.

I almost replied to BC1's comment on the "disappointments" thread until I thought maybe it would be better served spun off into its own thread.
It seems to be agreed upon (myself included) that Bill Cullen was not a good fit on TJW, as he ground the show to a halt (it bears repeating, but there was an episode where one question was asked for the entire 30-minute episode).
What's another show where either an established host or announcer, just was not a good fit?
Mine: Gene Wood when he filled in on "The Price is Right" after Johnny O passed away. I love Gene in just about everything else he did......But he did not fit in at all on Price.