I used to like Letterman in the 80's before he moved to the current time slot. Then he started berating Paul Shafer and the cue card guy all the time and I said that was enough. Cher was right, he's an asshole.
Leno may not be that good and yes, he is too much of a kiss ass but he has interesting bits.
Conan is funny but he has all those same mannerisms that he has used over the years that are getting very tiring. Skins is right, Triumph needs his own show.......for me to poop on! LOL!