I like dark and serious, so that works for me. I didn't go in expecting A, B, or C to happen, which allows for the story to be told to me.
It seems that the problem with it for readers, is that the Easter eggs and references weren't enough to redeem how the story was told. And the problem for the casual fan is the length and obscure references can leave people confused.
I enjoyed it. 8.5/10.
Bottom line, I'm bummed many people didn't find the same joy in it that I did.