We know hosts have opinions on certain aspects of the game they host. Sometimes they find ways to comment on it.
Drew Carey is certainly an example, openly complaining about how long Three Strikes is, looking at his watch when going through the "one of you 4 that bids closest...", how ugly the green and purple wheel was (okay so he was RIGHT about that) and giving absolutely no enthusiasm for the perfect showcase bid (along with other aspects of the game where some enthusiasm would be appreciated, but I digress)
Pat Sajak was obviously not a fan of the WOF category "Megaword". He'd feign enthusiasm introducing the category, and when he asked the player to form a sentence, he had a look as if he was thinking "why am I bothering to ask... the producers will accept ANY sentence"
When PW+ redid the puzzleboard to the blue checkerboard motif, Allen commented he thought it looked hideous. His disapproval of some of the rule changes also showed through his face. I don't think Allen liked the changes in Password All Stars either, with the option being decided by flashing arrows, as well as a complex new lightning round.
Richard Dawson certainly spoke up whenever a contestant said an answer that should've been accepted but wasn't on Family Feud, especially later in the run. In fact, in the show's later years he simply told the family "we're bringing you back" without consulting the producers.
Bill Cullen probably didn't like the judging on Pass the Buck, and he found some subtle, gentle ways of commenting on it.
While this may not count, as it was a pilot, David Letterman obviously was growing disinterested in The Riddlers. He made comments on how "exciting" the game was, and joked to go out and buy the home game. The panel wasn't enjoying the game much either, especially Michael Mc.Kean. However, David's trademark humor really showed through. He could've been a fine game show host in a Groucho mold, but with a more compelling format.