I've been twice. The garden burger was uninspired. They need to find a better source for their buns. The caesar salad (either the "Mighty" size or the smaller side salad) was pretty lame: two times too much dressing.
The server's attitude seemed to be that quantity takes priority over quality (they kept asking my friend if he wanted refills of french fries (I tried one, found it disappointingly soggy, and had no more).
I see nothing to recommend at Red Robin.