I haven't kept up with this thread that much, but I'll give a couple of mine.
The "carnival" set of Most Expensive, used for about 25 years, was the worst set the game ever had and its current set, in use for 10 years now, is the best (and this is from a person that loves Five Price Tags). It never looked in place and always made the stage look more barren than it already did. It was just ugly and I never liked seeing the game when I'd watch the show first run or older episodes online.
Bob Barker has slightly ruined the legacy of The Price Is Right. He is a petty man and all of his gerrymandering with not only his version of Price, but the versions hosted by others, has, in my opinion, severely hindered keeping many memories of the show alive. I appreciate his dedication to animal rights, but thinking that wiping all appearances of your association with furs means that it didn't happen is wrong and short-sighted. Nothing is wrong with thinking a different way formerly. So many episodes have never aired since broadcast because of this short-sightedness and there must be some confluence of his influence that's keeping Price off of Buzzr (along with issues perhaps with CBS).
I also think he did the show no favors by kneecapping the types of cars that could be on the show with his foreign ban throughout the last 15 years or so of his tenure. I appreciate the effort/gesture for a time, but there was a point where it should've been lifted so they could spruce up the car rotation. Say what you will about cars now, I appreciate the variety that shows up now.
This post, by the way, was in no ways meant to be a designer accessories on Bob post. I wouldn't say some of this to his face and I'll still praise his hosting, which was top-notch. But the man had an ego and some serious misgivings because of it.