As a timeshare veteran of about a decade and current owner of five weeks, I would suggest you rethink this statement. In fact, some of the smaller resorts in the best seasons in good locations are the very best to own. That is because the demand may be far higher than the supply. Therefore, you can use the exchange companies to trade your week for almost anything.
Some of these small resorts are well managed and have reasonable maintenance fees. While the Marriotts are pretty nice resorts, they have very high maintenance fees and aren't the best choice for all.
JMHO.
Sheila