The top-of-the-line Disney resorts are more or less comparable to a nice Westin, Marriott, or Hilton, but not the flagships of those chains. And, that's not even the high end of the hotel industry---that's occupied by places like Four Seasons, Ritz Carlton, etc. Disney is no where near that level, even at the Grand.
There are a lot of potential explanations for this. One that you sometimes hear is that the sort of people who typically stay at (and pay the prices of) a top-shelf hotel are not the sort of people who come to downmarket tourist-trap Orlando, and so it is not worth it for Disney to reach for that market. Personally, I don't buy that; there are plenty of high-end places that do just fine in the area, including a brand new Waldorf=Astoria, an existing Ritz, and the under-construction Four Seasons that Disney just sold a bunch of land to. Instead, I think it's just that Disney doesn't really know how to offer that sort of experience, and they are content instead to offer superior location combined with good, but not great, service, amenities, and furnishings.
Edited to add: even their timeshares, viewed *strictly* as timeshares (as opposed to "part of Walt Disney World") pale in comparison to the better properties in Orlando---including the top-end properties developed by Marriott, Hilton, Starwood, and even Wyndham. Of course, they *are* "part of Walt Disney World", so in Disney's favor, the comparison is moot.