We almost always eat at the City Walk & hotel restaurants. But, the Oak Tree Tavern at IOA is good. I like the turkey leg meal. You're given a lot of food and IMO, it's not very expensive at all. The food is much better than typical themepark counter-service food. For snacks, I like the lemon slushes at IOA & US and the mouse juice & goose juice at IOA.
Hi Mythos, Finnegans & Lombards are all good, CS Louies, LaBamba, Monsters Cafe in USO and Burger Digs, Thunder Falls terrace, Croissant Moon Bakery at IOA
I agree with pretty much everyone on here. Mythos, Enchanted Oak (for fast food) and Margaritavilles are my personal favs. But there is not much there thats not good. Universal's restaurants are probably better than any other theme park in the world. The only thing that i can think of that competes is the world showcase restaurants at Epcot.
With the new menu items that just came on the menu you should make MYTHOS one of your stops. You will not find this type of resturant or quality of food INSIDE of most theme parks. Disney has them outside of the parks at the resorts.