Yep! I like the fact that certain things are open to interpretation too! And also the fact that re-reading the book you notice things you haven't before. There are things (some even little things, not really important but that still enrich the book) in the pages that make me like the book even more.
Some things are not explained, but in them you can find a certain symbolism, which fits well since this story is centered on mithology and the Olympians.
For example, the way Ares and Eros travelled through the different "reigns".
When Ares has to take Diana to the reign of Harvest, he finds the passage by disrooting a plant.
When Eros from Firenze takes Diana and the others to his father's reign, inside Mount Etna, he does so through a door with written "Senza Uscita" (no exit) of a shop called "Bellezza e la bestia", which is the literal translation in Italian of "Beauty and the beast" (in Italian it is usually translated as "La bella e la bestia", though), obvious reference to the fact that "the beast" Hephaestus is married with "the beauty", Aphrodite =)
About the pacing...maybe it is because I'm used to mangas, but I haven't found it too slow, and I don't mind at all the fact that it seems all a long arc, on the contrary this makes me like the story even more, and in my eyes it makes it perfect to be used in a solo movie!
This said, I would like Azzarello to continue to write Wonder Woman. If he can't, then some other writer who will continue from what he has built,
Soule for example. I like his interpration of the title "god of war" in Superman/Wonder Woman, and also the fact he has reintroduced Doom's door and created Hessia.