It was basically a single joke extending for way too long to the point of making Eminem and the audience uncomfortable.
Colbert promised that he would have a lot of similar "humor" that made people uncomfortable on his show.
I wonder how long that will work out for him?
Letterman lost audience because he was slightly edgy. Colbert's numbers could plummet if he tries to do a late night version of The Office.
I would be surprised if Colbert’s show last over three years. I think even if we finally get a Republican president, Colbert’s brand of humor, is somewhat confined to making fun of anything conservative, and everybody knows it.
When Jon Stewart left his show, I think that marked the end of an era, where a cursing, openly lying propagandist would be taken so seriously. Every dog has his day. Secondly, Colbert seems to radiate unhappiness, bitterness and dissatisfaction. That gets old too.
Edgy? Yeah, if by 'edgy' you mean boring and dumb.
Letterman had about half a dozen running jokes and that was it.