Darling Harbour is certainly overpriced but there's a metric fucktonne of amazing restaurants in that area man.
http://www.sydney.com/destinations/sydney/sydney-city/darling-harbour/restaurants
I have only been to a few so i guess im generalising a bit. Crinitis is a no go. I have been to the darling harbour one and the one in manly..both not worth it. And i went to a couple of others. Food was ok but service was abysmal. I did however go to meat and wine co years ago and it was very good.
I still think you are better off going to newtown or surry hills. Newtown especially..so many different cuisines to choose from.