It's not that he dislikes steampunk. He's enjoyed some of the books. He doesn't "find anything intrinsically wrong" with the aesthetics,
Because you see, if you spend a minute or so thinking about it, steampunk takes place in a period in time when horrible things were done to large numbers of people, as a matter of course. There was nothing romantic or lovely about it. And there's something just a little bit creepy about making it so.
Not to mention that this particular branch of science fiction is kind of lacking on the "science" side. . .
But don't read what I have to say. The rant is much better.