Another argument they use is that when the fanart is better than the official art, then the original sucks so badly only idiots would make fanart of it in the first place. They said that they could just draw a stick figure and get millions of fans drawing fanart of it if it worked that way. As for the plot and characters, they generally hate the entire concept of "moe" and anything with lolis in it, and call all of the fans of such things pedophiles who live with their mothers and will never get a real girlfriend.
As for Ryuki, they say that the American actors can't act worth ****, and they removed all of the awesome stuff like having a Rider who was a serial killer, and instead replaced it with a generic "lol alien overlord" plot.
(Keep in mind I'm not saying this stuff, I'm just saying what they say, most of it is actually word - for - word).