Richard Pryor and Robin Williams were the only 2 I laughed with, unless I went back to Johnny Carson. The rest, and current, were merely lousy ‘pretenders’ to comedy.
I think they just missed the memo..
Colbert is just NOT funny.
And the late night talk shows have veered away from being funny, variety shows to post nightly news, news opinion shows, featuring interviews with the anchors from the previous day’s shows plus various democrat elected officials.
Letterman, was definitely left wing. But the show had enough humor. And the show was not politics centered, or in your face propaganda. So, it was at least able to pull a varied audience.