Yes, Narcoossee's is worth two credits, but do your math just to be sure.
That is, look at the menu on All Ears. If it looks like you won't get your money's worth out of two credits, I'd pay the meal there out of pocket and use the two credits for two other sit down meals. Personally I think using sit down credits for breakfast, even character buffets, is a waste because you're not getting maximum value for your money.
CRT is really a waste of two credits because of the forced photo package that's included with your meal.
Back to Narc's, if you're on the deluxe dining plan which includes appetizer, entree, and dessert, then it really is worth the two credits.
Narcoossee's is one of my favorites.
Restaurant Dining Menus from Walt Disney World
Narcoossee's - Grand Floridian - Dinner Menu