Any show Bill Cullen didn't host.
Decades ago I remember a thread popping up on this Forum - "Imagine if Bill Cullen were still alive and willing to host a new show. Can you see him hosting WWTBAM? Deal Or No Deal?"
I personally have a hard time imagining either, but maybe that's just me.
On-topic example, I remember from the fan sites that described all the game rules, odds/ends, etc., there was a show from the late 80s/early 90s that had an awful host and Jim McKrell announcing (can't remember the exact show). The person describing the show did in fact write "Why didn't the producer just swap Jim and this guy?"
Again decades ago, the old Loogaroo's Game Show Lair website had a rulesheet/review for "I Can't Believe You Said That", a show that came and went in 1998 that I myself never saw, hosted by former NBA basketball player John Salley...with Marc Summers as announcer. Loogaroo had the obvious reaction.
Hi Tim if you're reading this. Used to really like your site - I even read some of your political columns and "Dreamless Sleep" werewolf stories.
To give my own answer, again involving Marc Summers - when the 2018 Beat The Clock on Universal Kids was in the works, Mr. Summers posted on his Instagram page a casting notice he had somehow found for it, starting that they wanted a "Marc Summers type" as host.
Yes, I realize that in 2018 Marc (A) would likely have been seen as too old and (B) had he been hired to host the IMO awful Universal Kids Beat The Clock, he would likely been unavailable for the IMO note-perfect Double Dare revival on Nickelodeon later that year.