Another thumbs-up for TUG. (
www.tug2.net). They have a very useful "Timeshare 101" section with more info than you'll ever need, and it's free. (Just click on the "advice" link on the top red bar.) There's even a section about
DVC.
The reviews (which require a membership...best ten bucks you'll spend in timesharing) are quite exhaustive, and are posted by subscribers.
When you read the reviews, beware of a few things. First, the average (on a scale of 1 to 10) is taken since the very first review. Some resorts are hurt by this if they've done huge upgrades in the past few years. (One timeshare I wanted to visit had a score of only 7, but all the low marks were given five or six years ago before a major renovation.)
The other thing to notice is WHO wrote the review. DVC resorts are among the highest rated on all of TUG. But others correctly point out that most of the reviews are written by DVC owners. Owners will always bias the ratings upwards.
It's best to read the reviews in full, notice the date, and see if it jibes with the RCI or II description rather than just looking at the number.
Timeshare Today offers much better, professional, objective reviews, but has far fewer of them.