The Flamingo no longer has any "standard" or "deluxe" rooms left, they have all been renovated to FAB rooms, and you can no longer book them online.
I've stayed in the newly redone FAB rooms and have stayed in the GO rooms many times. My rooms have always been clean. As a note, I am n a hotel 150+ nights each year as I travel on business, and I LOOK to see if the room is clean prior to unpacking.
The GO rooms are my fave, love them. But there's absolutely nothing wrong with the FAB rooms. If you are expecting the Wynn, you will be disappointed. If you are expecting a pretty solid room, you will like it.
I've stayed at all the CET props except PHO, and spent many nights at Caesars last year in some really awesome rooms. But I love the casino and the vibe at the Flamingo, so now I'm choosing to stay there instead of Caesars.
diane