I agree about the racism. And people may try to say "It was normal for the time.", but it's been proven that he was over the top, even for his time period.
However, later on in his work, he "corrected" that mistake, and even discussed in his letters a change of heart of sorts regarding the subject.
I don't have so much a problem with his wordiness as his dialogue, which, though mostly nonexistant, is quite bad. And I also agree that his human characters are quite the mannequins as has been earlier noted.
However, I believe this was intentional as his entire purpose in almost all of his work, particularly his late-career work, was to promote a cosmicist view of the world.
Thus, humans don't require much description as they're entirely irrelevant in the scheme of events described in the story(ies). This may seem like a cop-out, but if you look into the amount of detail he put into his "monster" characters, it's quite apparent he could've done the same with his human ones, but chose not to.
I rather enjoy his wordiness. It presents a very good, clear description of the surroundings but leaves enough space for you to form whatever horrible imaginative details are disturbing to you personally. This is where his genius lies. He leaves room for personal fear.