If you do not have a dining plan and eat sit down meals, then for sure it is worth it, especially if you drink alcohol while eating. If you use a dining plan, then Tables is only used for the extras not included in the dining plan. Also, if you are only planning to come once in a 12 month calendar year, then the price you pay for TIW, may not be worth it.
I myself have Tables, but i go more than once per year and even though i buy the dining plan, i usually have some extras during meals that make it pay for itself. Plus,
One side note and the reason I buy the card... If you rent a car or use your own car and want to use valet at any of the hotels you are eating at, when you use your TIW card, valet is free. I have even popped into the local bar when valeting at a hotel that we haven't eaten at and bought one drink using my TIW card and have gotten the valet for free. There is no minimum on using the card or getting valet included.