Red Robin is a solid choice. Simple, burgers, sides, simple. You can get bottomless fries or exchange it for a salad. My only complaint? I don't feel like there is much service. The business model is to seat you, get you a drink and then wait for food. Great, but my beverage is running low? Something wrong with my food? I get one check back. And it is not that it is bad service, it is just corporate.
Also - appetizer sixes tend to be a little small. Actually, really small. Never really worth it.