Joe Rogan adds a lot of excitement. His passion for the sport and naturally exciteable demeanor (read stoned) makes the show. My friends watch every UFC and have since about UFC 7 at my house. They do not follow the sport other than that. They know the fighters when they see them but they are the definition of casual fans.
Every one of them said they prefer Joe being on the show. They all commented that the show seemed more boring as a result of Joe Rogan not being an announcer.
At first I though there was a contract issue or he had been Quatros'ed but that clearly was not the case as that the UFC rode Joe's name like a pony last night.
All of you Rogan haters should go choke your self with your own arm.