I really don't understand why people dislike BLACK DOSSIER. It's the only one of the books I still re-read, and yes, it's Moore and O'Neill having fun, but in a way, isn't that what LOEG is all about anyway? All I know is I bought this book in 2007 and it STILL gives me enjoyment every time I read it, far more than I can say about pretty much all other comics I've bought since then.
And I think the fact that its story is oblique rather than on top has something to do with it. The other two plot-based ones are wonderful in almost every way. But having absorbed the story, they lose something on the next reading and it's more about looking at the details. This one is ALL "the details." And I'll add that it's some of O'Neill's wittiest and most inventive work.
I'm sorry, but I like watching these two show off. So sue me.