I admit that I like memoirs of ordinary undistinguished lives. Reading them I feel part of a sisterhood of plain janes. Some have been addicts, and I sympathize with their horrors, some are ordinarily quirky people, and I laugh with their foibles. Yes, the latest "I had a life that was filled with interesting horrors/ amusing detours" book may not shake civilization to its core, but that's not what I read them for. OK, I admit it- to me, they are the written equivalent of television. I read, I'm briefly entertained and I move on.
Not every book has to be a deathless literary feat.