If I get good service, the tip will be close to 20%, these people work hard for their money. Poor food and product is not the servers fault, but inattention and bad service is. I also look at how a server handles a bad situation. Being self-employed I really am keyed into what service to the customer means. Personally I thrieve on repeat business, and as I get closer to retirement, I'm not looking for new clients, want to give quality service to my old ones. This is how I base the service of others, and the businesses they represent. In short, I reward good service.