While the food is really good at Ca Grill, you should do the math and you will find that none of the signature restaurants are a good deal on the dining plan. If you multiply the entree/dessert cost at a 1TS restaurant times 2 and then compare that to the cost of an entree/dessert at Ca Grill, you will see that you will get more for your credits by dining at two 1TS restaurants over eating one 2TS restaurant.
I'm not saying that you should skip Ca Grill, I've eaten here many times but pay OOP as it's not a good trade for meal credits.