well,I would say it really depends on what you're planning to eat there.
We ate there in January on the Fantasmic package, and we happily would pay 2 credits again to eat there, The food & service was excellent, and we thought it was well worth the 2 credit/signature status.
Now sure, if you're just eating salads would not be good use of 2 credits per person ($50 salads, lol)...but if you're using credits on the Deluxe dining (or on the FAntasmic package), you're getting appetizer, entree, dessert & drink. So you wouldn't just be eating salads, I don't think.
If you just want the cobb salad & a glass of ice tea, then no, don't use your dining credits.
But if you're planning on eating per the Deluxe dining plan then it's well worth it.