> Never regretted reading them

Interesting! I'm surprised to hear you've had that experience. I pick out books at the library largely by the cover & back blurb, not by whether they're popular or well reviewed or whatever. And to be honest, I've picked out a lot of crap this way, where I turn it back in after just a chapter or two. I suspect that frequency of being checked out & popularity/well-reviewed-ness are correlated. So I also suspect (admittedly without evidence) that my algorithm of picking somewhat randomly means I pick out books that are not popular with some frequency, and I've definitely regretted many of my choices. So it's surprising to me that you haven't had any that were terrible.