This hotel is not for those with fear of heights!
It has a "breathtaking 47 story atrium". Search for images of "Marriott Marquis Atlanta" on Google to see it first hand.
This would be okay for those scared of heights, if only there were alternatives to get around the hotel while avoiding this breathtaking part. There are none. Even "1st floor" rooms involve walking narrow hallways, beside short railings, 8 stories above the lobby.
This is a deal breaker for many, as it was for me. I was forced to ask for a refund at the front desk and stay at a nearby hotel.
If you're wondering if I have an unusually restrictive fear, I doubt it. I experience roller coasters, airplane flights, tall buildings, and bridges without any trouble. I would sooner skydive than stay here, though.
Otherwise, this is a great hotel.