The meaning of a star rating varies from site to site, so there's no master list of star ratings for Disney resorts that's good for all sites. They only have meaning when you're comparing to other hotels on that same site.
For instance, some systems assign stars based on the number and type of amenities. For some, it's an end-user rating, whatever someone wants to click on their web site. For others, the stars are assigned by reviewers employed by the site, based on their perception of the hotel's overall quality.
If you're trying to guess which Disney resorts you're seeing offered on Priceline or Hotwire by the star rating, there are are loads of online communities dedicated to "gaming" those sites. Do a little googling and you'll probably be able to track down the star ratings for each of the Disney resorts.