I finished it, but it was a slog. I could recommend reading the first half and then switching to the Wikipedia summary to see how it concludes.
Agree and I actually really enjoyed that part of it. He kind of seveneves'd it but I think the back half of them are fun. Wrapping up a story is never his strong suit. Lot of "and everyone sat down for a nice dinner. The end". Always worth it though.
That said, I personally also prefer his earlier books. Granted, snowcrash was a young mans fever dream, and you kind of grow out of it. A young ladies illustrated primer? That was kinda cool. Quicksilver? Yeah, an unexpected history lesson woven into a pretty long story. Liked it. But seven eves? No. That one kind of killed my love for his work. I dont know why, but he kind of overdid the long-story-arc thing there.
Edit: I've read and very much enjoyed a ton of Stephenson (Cryptonomicon, The Baroque Cycle, Anathem) but his recent stuff is tailing off for me. I don't know if it's me or him.
The first and the second part of the book (which constitute most of the book) stand on its own. I think it's better to pretend the 3rd part doesn't exist (which is IMHO rather easy since it's just unnecessary) than to discount the whole book.
There's a story that he only allowed that book to be reprinted so that people would stop paying hundreds of dollars for a copy on eBay.