I could be wrong, but the biggest problem with that article is that they keep conflating the US-ian meaning of the word "Conservative" with the more general meaning. As you said, they tried to separate the two, but pretty much failed. IMO their article on Liberals is much more disappointing, as it's just self-indulgent satire without any meat behind it.

That said, RW's mission statement is to combat pseudoscience and authoritarianism; so at least they wear their biases on their sleeves. They don't claim to advocate for rationality in general, despite the name. I think that, when they stick to their core mission (as opposed to venturing into politics in general), they are relatively successful.

I have to admit, though, that I don't have an opinion on the Ann Coulter thing. I don't know much about her, besides that she's a pundit who said some crazy stuff at some point.