The good ones love the tip system. They get the most tips, and also tend to be the types of people recruited to the higher prices restaurants where higher tips are normal. They draw in repeat customers for their great service.
I used to know a waitress who was making just as much as her engineer husband. She looked good for 55, but 55 will never look good enough to draw in many high tips based on looks. (good lucks is a factor in service to a lot of people, but it didn't apply here)
The bad ones get bad tips and hate the system, but they should be fired anyway.
On the one hand I don't like having to figure tips. However a few times I've got bad service and at least I could do something about it.