Well, it seems the bad reviews come mainly from people who are not familiar with the Aman-concept. If I complain I don't receive a check all the time, I'm definitely in the wrong hotel. Nevertheless it's a no-go, when the final bill is incorrect. Also I fully understand complains about check-out times and time-schedule of the plane. Especially the plane is my biggest issue with Amanpulo.
So I guess they have problems and the hard-product of the casitas is a big issue.