Hey seanjaz! This is a great question, thanks for posting it! Recently, it was announced that the Hotel Reviews section will be removed from Insiders. Because of this there haven't been any newer Marriott properties, such as Atlantis, added to the list for review.
Below, I've pasted a post that the Community Manager published recently regarding the new Verified Ratings and Reviews on Marriott.com. This is a very informative piece that you may find useful. Let me know if you have any questions!
Thanks again for posting!