I don't generally like burgers, but a friend of mine took me to Fuddruckers when I first moved to Atlanta, and I've been hooked since. A warning - the burger always arrived cooked more than you ordered it. Well done - almost burnt. If you're looking for medium well, order medium. Well done, order medium well. You get the idea. There's a short wait for your food after you order it, but there's so much stuff to look at in the restaurant that you hardly notice. It's a great casual restaurant.
Pros: friendly, easy to get to, inexpensive
Cons: slight wait for food