Before I give any opinions on food, I'm first going to give my opinion on using TS credits on a signature. If you are on the
DDP (1 TS, 1 CS, 1 snack) I wouldn't use 2 credits on a signature. There is no real $$$ value to it. If you figure that the average TS credit is valued at $30, that means you are spending $60 per person, which doesn't include any wine/beer/cocktail, it doesn't include an appitizer and it doesn't include tip. I know if we (my girlfriend and I) are eating at a nice restaurant we usually have appitizers, entrees, desert and a drink or 2. After spending 2 TS credits ($60) for the entree and desert, then add the $10 drink, $15 appitizer and deserving tip per person, you have to consider that it will cost an additional $30-$50 per person. Now a meal that normally would cost for everything about $70 per person could run you $100 per person. Not a wise use of credits, at least not for us.
Now with that out of the way, to the question at hand. We are personally big fans of Flying Fish and Shula's (not on the dining plan). From our experience FF is the best place for seafood and Shula's has the best steak on property. We also like Jiko, Citricos and Artist Point.
Also, who is included in your party? Is it just adults? Young ones? Tween/teens? Depending on who is there may depend on not only which restaurant food-wise is best, but also where you might be most comfortable. Cali. Grill for example is pretty kid friendly compaired to other signatures. FF can also get on the loud side. A place like Citricos or Artist Point tend to be much quieter and more romantic.