I never finished Rite of Passage, though I wouldn't say it was a bad book. I think the trouble was that I tried to read it a dozen years or so after publication, and it had already influenced a generation of writers. I haven't finished The Wind-Up Girl either, though it's still on my iPad. Maybe one day. I didn't enjoy Timescape much, though I did finish it. Blackout/All Clear is one I never want to read, thanks to the bad press it got.