If the restaurant in question is a local
place for me AND
I hear positive comments from others even after I have a negative experience, I will probably give the place a second, and maybe even a third try. After that I would go back only if I hear of an Ownership change.
However, if I am traveling, and only pass thru an area once in a Blue Moon, once
is enough to get put on my No-Return list. Life is too short and there are too many good places out there to put up with filth, lousey service, & poor food!