These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Earth's Children
Author Filibuster: In Plains of Passage, there's a Scenery Porn segment just like any other which suddenly segues into several pages of telling the reader the despoiling of nature that's going to be committed by the people of the future is, in fact, wrong on a spiritual level.
Canon Sue: Ayla; Jondalar as well, to a lesser extent. This is somewhat justified considering that both of them have traveled alone or with extremely limited support for a number of years, and you'd have to turn into some sort of God-Mode Sue to survive that in the Ice Ages. But throwing Fixer Sue and Black Hole Sue traits on Ayla is largely agreed to have gone too far. Your heroine does not have to be perceived as the incarnation of the Great Earth Mother to be interesting, nor does she need to have singlehandedly influenced the course of human evolution. The technologies they invent together are each described with a plausible thought process, but the sheer number of them is only believable if you take them to be allegorical characters.
The real kicker is not the fact that she thinks she's ugly, which is because of the beauty standards she was raised in, but the fact that she manages to invent the wheel and many medicinal practices all by herself and gets guys fawning over her left and right.
She also domesticated the first dog, cat and horse in... a yearish? So yeah, still very Sue.
She can also learn languages in under a day and her only enemies are people considered jerkasses by everyone else, as well.
Fanon Discontinuity: Many readers prefer to think the series ended with "Plains of Passage", book four. The fact that it took twelve years for the fifth book to be published and that Seasonal Rot kicked in pretty hard with that installment certainly contributes.