I just can't believe this entitlement attitude of so many posting here! The idea that you feel your employer isn't paying you enough, so I as a customer am OBLIGATED to ensure your wages are increased is insane! If the service is bad, does my bill get cheaper ? No .. . .?
Why is it my responsibility to ensure you are happy with your earnings, and your job!?
Yes if your service is bad your bill gets cheaper because that's when you don't leave them a tip. If the service was average, then pay average.
In Michigan, waitresses make about $2.65/hr. If you don't leave a tip, your waitress still has to pay 5% of your total bill, out of pocket to the other waitresses as tipshare. Your server loses money out of their paycheck by serving you!