I like Dawkins a lot, but I have also noticed that some people* I know don't like him because he's aggressive and insulting towards some of the morons. They feel that his attitude is going to prevent him from convincing anyone, and may in fact push religious people even further away from rational thinking. I think these people are mostly wrong, because I know from experience that no matter how politely you put an argument to a woo believer, they will get angry. If they don't get angry right away, they will get angry when you crush their counter arguments.
There are moments however, when even I feel that he's too aggressive, for example when he talked to Ted Haggard and
immediately said that what he had just seen made him think of a Nuremberg rally
WP. It would have been more interesting to see him go in there well prepared to counter any argument Haggard might have, and own him completely when he says something dumb, like "...and it doesn't contradict itself". (Haggard said that about the bible).