Deno's is not exactly fast food, but it's not really a nice sit-down dinner restaurant, either. They offer traditional Greek meals (souvlaki, gyros, pita sandwiches, etc.) and regular burgers and fries. The cheeseburgers are wonderful, but the Greek menu is not bad, either. \r
The prices are reasonable for the quality of the food - under $10/person. I'd recommend Deno's when you want a quick, not-so-healthy dinner.