I also have read that page. And they not only talk about Mayan Palace. They have a Black List of the most fraudulent resorts: http://www.timesharescam.com/timeshare-complaints-resorts-black-list/.
I think is very informative.
A timeshare purchase is never a good idea. Some people buy them with the idea of a financial investment, but a timeshare is not a good investment at all. Besides, there are lots of fees involved. There is a page that has good information about timeshares and how to use it properly...