I am a good tipper (20%) when the service is excellent, If the service is average I leave 10%. If the service was horrible I will leave nothing. No server automatically receives a tip just for serving me, a tip is earned not a sure thing in my books. You also need to rememberthat your server isn't responsible if the cook fucks up your steak, they are just serving it... It is very rarely I get such horrible service that I leave no tip, but it does happen.