Sorry, just jumping in here and have stopped reading the thread at this point to respond to the comments about the waiter not being in control of the cooks screwing up an order. Nota bene: I am a long time restaurant veteran.

The waiter has EVERY CONTROL over what he brings to the table. If he leaves the kitchen to serve me food that is prepared wrong, it is entirely the waiter's fault and should be tipped accordingly. If I am informed about a kitchen mishap with my order and I'm made to wait, it's really about a 50/50 shot the truth has been told, but I'll know what the truth is - and will tip accordingly.

Back on track about not accepting credit cards -

There's a seafood restaurant in Branford, CT which has been on very reputable short lists of top seafood restaurants in the world for decades. They have never accepted credit cards. It's part of their charm. They let you know when you enter of the situation. I'm sure it's been an issue for them from time to time, but in no way should it reflect in the tip. That's your fault.