City walk has some great restaurants for all flavors and budgets. We like Bubba Gumps, Hard Rock Cafe, Bob Marleys, Margaritaville, Pastamore, Latin Quarter and Emeril's (our favorite but $$$$) are all good restaraunts IMO. Inside IOA is Mythos which is a great restaraunt as well. There are some other good restaraunts at the other on-site hotels as well such as Emerils Tsoup Chop (RPR), Moma Della's (PBR) and Trattoria del Porto (PBR).
Good food is not something that is lacking by any means on-site at Universal Orlando. As others have said if you want to go to the famailiar chain restaraunts, just take a short drive to Internationl Drive for anything and everything in chain food dining.