I have no clue about the dining plan, never use it, but I did have a steak I ordered at Boatwrights that I just did not like. Something about the marinade or the sauce used made it very sweet - I prefer a smoky or savory steak.
I had just left it on my plate, wasn't going to send it back, since I figured I should have read the menu better, but the waitress noticed and asked if there was a problem. I told her no, I just didn't care for the marinade. She immediately asked if I wanted something else on the menu, or that same steak made without a sauce. I told her no, because the rest of my party was ready to go, and I had filched bites of everybody else's side dishes and was full. They took the steak off my bill without me even asking for it.
I really appreciated it, and tipped accordingly that night.