There is an element of holding feet to fire. However, next time there's a debate, just listen to the tone, logic, and quality of argument from him, and pretend that he is David Gregory or Russert interviewing the President.
To me, he substitutes shrillness and illogic for substantive and reasoned positions, something for which we justifiably deride liberals in the press.
That being said, he's a wildly successful talk show host and I'm not.