they do have a rating system which somewhat realtes to the level of services available at a given property.
The dive shop I work at is located at a timeshare resort which has trading privledges through RCI. It was an "International Resort of Distinction" when I started working there. They have since opened a spa and a kids program, and now they are considered a "Gold Crown" resort. Seems the distinctions relates to services available.
That said, the property is quite nice and people who exchange in are usually very pleased. Occasionally stuff breaks, and the staff always acts promptly ( in Caribbean terms) to fix it.
The newer buildings are technically considered a seperate resort, but share the same grounds. Those buildings are superbly appointed with in-room jacuzzi tubs, washer-dryers, dishwashers in the kitchenettes, and even a small pool dedicated for each of the newer buildings.