Moore's a writer. He has elevated and transformed comics through his participation in the medium. The maturity and intellect he applied to Swamp Thing started a trend so strong that it has, unfortunately, had knock-on effects which permeate 99% of the comics on the market.
Dude has a strong personality and strong opinions, which he is welcome to. His comics are consistently amazing, so respect the art even if you're not 100% on board with the artist.