I went once and was quite happy with my burger. There's none of the following chains in my area so I tried them all when visiting the in laws.
5 Guys was clearly the best. It's a diner style burger. Done right on a flat top.
Cheeseburger, Cheeseburger was a very solid second. A good burger and I didn't think too expensive.
Red Robin was a distant third. Absolutely nothing special IMHO.
Because I don't have one locally, I've only been once. I thought it was very good albeit a bit pricey for a burger joint. I had a bacon cheeseburger(I think it was the 1/2 pound) with guacamole. The beef was especially flavorful, and I recall thinking the guac actually detracted from the burger. My wife and I split the combination onion rings(excellent) and fries(good) basket, and it was still too much to finish. Cheeburger Cheeburger is a place I'd hit occasionally(maybe once or twice a month) if I had one in my area.