Prior to the opening of the Skyliner, Caribbean Beach Resort generally was considered the least desirable Moderate Resort. It's the oldest Moderate Resort, many rooms were very far from the lobby (reduced since the Riviera replaced some of the farthest room, had a food court that was too small for the number of rooms (again, helped by the Riviera), and a rather slow bus service.
On the plus side, I have always enjoyed CBR's main pool. The theming is pretty cool!
The opening of the Skyliner, along with the removal of the farthest buildings, has turned CBR generally into the most expensive Moderate Resort.