I'm really glad to see so much positivity in this thread. I think Destiny and Vanguard are the only two other works that have been so universally acclaimed. All the more surprising for having come out of nowhere! Rough Beasts was controversial at best, and so was ZSG, and from those plotlines, BAM. I'm still impressed.
EDIT: Actually, checking Sho's average list, that's numerically true - this book is third right now, and the only other books in the top 7 are Destiny and Vanguard. So how about that.