To me, this is a despicable practice, IF that service fee does NOT go to the employee. Regardless, if there is a service fee added to a check, if the service is good, I will leave a few dollars more in cash for the server. I usually don't bother to check to see whether the service fee goes to the server or not, as often you don't get a straight answer. If the restaurant was only fair, I generally don't go back.