I don't like eating at full service restaurants. Too slow, too expensive, and too limited. I eat at the GC es because it is economical, healthful, and has plenty of options. There was a time I was eating there every weekday when I was working in that part of town. In and out in 15 minutes.If you are eating at a buffet, like Golden Corral, 15% isn't bad.
But if you are dining at a full service restaurant, 15% is abysmal. The wait staff don't get paid enough, and are expected to make it up in tips.