That is fair. Moore's love of language is a big part of his writing, and I think he's probably a more text-heavy writer than most. The book is deliberately set up to be like that, but I can see why it might be off-putting for some.
(He's up there in the top tier of comics creators for me, but you can look at other creators in that top tier like Frank Miller and see a stark difference in terms of how they deploy language. Miller is often - not always, but often - very economical with his words, usually to great effect.)