Originally Posted by Popps
18% has been in place for about 20 years, maybe longer.
Tipping 15% at any proper tipping establishment is telling the server you were unhappy.
Tipping 18% is telling them it was fine.
Tipping 20% or more is telling them you appreciate their effort beyond the average server.
I am calling Bull ****. 15% is the expected amount to tip someone who did an average job. If you are going to get more fancy with a rating system then below average, average, above average you are over thinking it. By definition most waiters are average and deserve average compensation.