Hi RK! I use Tripadvisor too, but usually the reviewers are not timeshare owners, or experienced with timeshares, so their reviews often miss the mark. For instance, they may complain that a timeshare doesn't have daily maid service, room service, or a 4 Star restaurant. In other words, they expect hotel services from a timeshare and write a negative review, based on that expectation. On TUG, you have timeshare reviews written by knowledgeable timeshare owners, so I think they tend to be more accurate.
Everything on TUG is volunteer, so we count on our members to write reviews after they visit a timeshare. Many of the resorts that don't have current reviews, also have poor ratings, which tells me that Tuggers are probably avoiding these locations. If Tuggers avoid resorts with low ratings and negative reviews, they will not be posting new reviews.
If you have visited any of the resorts without recent reviews, I hope you will write a review. You will notice that TUG offers incentives for writing a review for some resorts that have no current info.
Also - This particular board (About TUG BBS) is specifically for questions about TUG - a good place to ask other travel questions is the TUG Travel board.