Pretty good criticism at
AV Club and
Reality Blurred. The producers are doing too much, making it too chaotic, and devaluing the game.
Thought the critique of the "Knowledge is Power" advantage was good, for example: this advantage would be fine in a vacuum on a normal season... the only way it could work is if you had the knowledge that someone else had a secret; that is... you could only be sure
in using it against an ally who had confided in you already, which would definitely shake up game dynamics. However, putting it in the same season as the three-way Beware advantage immediately cancels that out since now, who has an idol is public knowledge!
Same with the "Change History" twist... Probst wanted to throw a wrench in players always coasting into the merge, so, this season he says something about "earning your way into the merge", then, as soon as they do... it's undone. So what was the point? And of course Erika is going to choose to help herself in that situation, who wouldn't choose the gift of immunity for doing nothing?
The audience simply has no clue why players are voting the way they are. It's all random. It's chaos for chaos's sake. The rules change on a whim, there seems to be no reason to try or not try, it's all about a few minutes of whispered strategy and nothing else.
(Although I'll argue that if we want to pinpoint a "Jump the Shark" season, a better candidate is Edge of Extinction, where someone voted out on day 3 gets to spend a month with the jury, re-enters the game at the end, and coasts to a win having not played, not betrayed, not outwitted, and not outlasted anyone else there)