Okay, here are my takes:
William Shatner when he threw the chair on Pyramid. Notice he never came back after that.
Tony Randall - a good game player but didn't come across as all that friendly, to me anyway. The producers of Hollywood Squares learned the hard way not to put Randall and Paul Lynde next to each other. Lynde was a chain smoker.
Henry Morgan - had an on-air verbal spar with Bennett Cerf on WML. I believe he was on MG '78 one week. Other than that, he basically appeared on G-T's panel shows.
Paula Poundstoine on TTTT and Judy Tenuta on MG '98 I absolutly agree with.
I don't think these were obnoxious
Jonathan Winters - Peter Marshall said in an interview that Jonathan needed characters to do to feel "comfortable" so the writers started including that in questions to him. I thought he was amusing, but yes he did eat up time on occasion.
JM J. Bullock - was loud and nutty, I wouldn't say he was obnoxious.
Richard Simmons - see JM. J. Bullock
Nipsey - he didn't eat up time with his poems, he was fine.
Fred Travelena - did imitations when it was HIS TURN on MG, he didn't hog the spotlight when other celebs were on camera, so I didn't have a problem with him.