If you are on the DxDP, then yes, it is worth it.
However, if you are on the regular dining plan, I don't think it is. If you break it down, a TS credit on the
DDP is worth roughly $30. For using 2 TS credits to hold any sort of savings, a meal would have to cost you $60 per person. If you look at the menu on allears, the most expensive entree is the filet at $40. The most expensive dessert is $9. Even if you add in $3 for a beverage, that's only $52 (or $26 per TS credit). Plus tip and any alcohol or appitizers would all still be paid OOP.
That is just my opinion, I personally don't feel there is much value in using 2 TS credits at any restaurant.