My husband and I stayed at the Royal Solaris Cancun in early December 2006 and it was absolutely terrible. This was our third trip to Cancun, and definitely the worst.
To summarize, the resort is run-down, dirty, smoky, smelly, small, and in major need of upgrading and renovation.
We are not high-maintenance people and we have stayed in Hampton Inn's that were nicer than this! The rooms at the Royal Solaris smell like mold and mildew, the shower leaks, the windows leak if it rains, the floor is always damp and wet, the ceilings leak, and the sheets feel damp and dirty. Everyone smokes and there are absolutely no non-smoking areas at all. People even smoke in the elevators, and there are cigarette butts on the ground everywhere you look.
This is about a 2-star resort at most. It is a low-class, run-down resort. If you are looking for a nice relaxing vacation, do not stay here!