Had the Sunday Brunch at the buffet. 22.95 was too...

Had the Sunday Brunch at the buffet. 22.95 was too much for what we got. We were there at 11 am and evrything was dried out. You pay as you enter. I paid by card and the cashier handing me the slip to sign and circled the area for the tip and they also listed the tip figure based on percentage. 22.95 for a poor buffet, I serve myself and I should then give a 20% tip BEFORE being served? Not again.