Those are editors' picks - unrelated to customer sales or ratings. This is a pretty common phenomenon in the world of literary fiction where (a) some are clearly just disappointed that the book in question isn't an easily digestible genre work and (b) many people are inclined to be especially vociferous about their opinion of something they've sunk 8 - 20 hours into.

FWIW, I thoroughly enjoyed Fates and Furies in audiobook format, although it isn't without it's flaws. Critic James Wood gave it a tepid review in The New Yorker.