The only people I have ever heard criticize Rush Limbaugh - both from the left and from the right - are those who have not listened to him for more than a few seconds or a few soundbites. He is a highly informed, top-notch entertainer and political commentator. But I will let him speak for himself (via Althouse):
"One thing I do that you won't find anywhere else in the media: I combine satire with serious commentary. I'm going to go back and forth within a moment's notice." Indeed.
So this really rubs me the wrong way.
Here's the challenge: listen to the man for 30 days straight, 3 hours a day. At the end of that time, you still may not agree with him, but I would bet that you will no longer be able to dismiss him. And you certainly will not find him either boring or inflammatory. He's been number 1 for so many years for a reason.