If you like steak, then Ruby River on South Virginia across from Peppermill is really good. Washoe Steakhouse on W. 4th street is where most Reno locals go for steak, so that is a good choice as well.
Most of the casinos have decent food, but you are better off if you can get away from downtown. Atlantis, Peppermill and John Ascuaga's Nugget in Sparks all have better food than anything downtown. If your stuck downtown, El Dorado is generally better than the others.
If you are looking for a great buffet, my first choice is always the Island Buffet at Peppermill. Atlantis is good as well. As for downtown, El Dorado has the best of the bunch if your without a car.
If you want seafood, Rapscallion is the best in Reno. It's located on South Wells ave.
Also hard to beat the Peppermill for good seafood. Friday nights the buffet will have a seafood theme, but they have a good selection most nights. Peppermill also has a seafood restaurant called Oceano, which is pretty good. If your stuck downtown, Fairchild's Oyster Barý at the Silver Legacy will do in a pinch.
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Nine in the pit with the Tenpin left standing. dooooh!!