I've read Cloud Atlas and De Zoet. I didn't read Bone Clocks, but I did read the associated novel, Slade House. Of these, Cloud Atlas is definitely the masterpiece. My reading was memorable, as I started it on vacation and while the first part was set on a creaking ship of sail, I was lodged in a handmade wooden hut with a grass roof that creaked in the night wind while the surf rolled in on the nearby beach. In that book, Mitchell demonstrated different styles in each of the different nested stories, and the way the characters and themes arched across time was impressive.
De Zoet was also very good, though we read it with my book club and several members pointed out that the climactic rescue at the temple was really out of place in the culture and people felt Mitchell was guilty of orientalism. We subsequently found an interview with Mitchell in which he revealed the scene was inspired by Ursula K. LeGuin's fantasy novel, The Tombs of Atuan, rather than by history, so I guess they were justified. Orientalism doesn't bother me very much, so I thought it was a great read.
Slade House was an ambitious attempt at a haunted house mystery with a sci-fi twist. I feel he wasn't quite able to pull it off, and there's a little too much exposition. It was certainly worth the read, though, and I gave it 4 stars (bumped up from 3.5) on Goodreads.