He is a very funny man.
Unfortunately, like many comedians, he is also very liberal. Since he often lets his liberal bias color his comedy, it becomes less funny.
In his defense, he's at least somewhat fair and intelectualy honest. Hence his reaction to (and willingness to publicize) the Acorn scandal.
I also place him above the MSM, because he is at least honest about what his bias is, and does not pretend to any sham impartiality, and as such actualy winds up being more impartial than the MSM...