I agree that Moore is a hack. However, I think he would agree as well. I once saw an interview with him where he was accused of being biased in his movies. His response was basically - “Hell yes I have a bias. I’m not trying to be unbiased. I’m trying to make a point.” [Not actual quote - merely my paraphrasing from a questionable memory]
I too would question the “dishonest” portion, however. He’s not fair and balanced - because he’s not trying to be. So he’s definitely not bringing up all the other side’s arguments. But that doesn’t make him dishonest. (He may have been wrong at times - but as many of our Bush supporters will remind us, there’s a big difference between being wrong and being a liar.)