It's said that TP quality is better than MMP quality that I disagree. I've frequently bought TPs that fell apart as soon as I opened them. MMPs are standardized and reliable, they have a lot of choices in how they make a TP and often they make the wrong ones.

Sure many MMPs are genre fiction but long long ago... you used to see really serious books like government reports on inner city riots, books by all the players in the Watergate scandal, books about science, shakespeare plays, serious fiction, etc. in that format.