Not my biggest pet peeve, but had a girl come in yesterday with a lotus on her lower back. Her first words were- "I want to do something with this. He messed it all up. I don't like it." So I look at it, and it's well done. Some of the magenta healed a bit patchy, but it was otherwise done by someone competent. She tells me it's too big and she doesn't like that there's not water around it.
I had to remind her that she SAW the stencil first, and gave him the go ahead. She seemed completely put off that I wasn't on board with her shit talking whoever did it, but that's not my style. The sad thing is, I know if it were a lot of the other shops around here, they'd just start bashing the initial artist, further perpetuating an unnecessary bad rep for the guy.