We never seem to tire of Hard Rock Cafe (including our two late teen daughters). We've also eaten at Nascar Cafe, NBA City and Margaritaville at CityWalk and they're just OK, IMHO. The girls have eaten at Motown Cafe and they enjoyed that. Oh, and Emeril's, which is fantastic, but not remotely like RFC!
We also like Mythos, but we had a bad experience at dinner so now stick to lunch. There are also some great restaurants at the Universal Resorts, and it's a good excuse to take a nose around.