We eat out one or two nights a week. I have been known to send things back. I do not like to as I get more annoyed as I wait for it to come back.

I have told the server that while I am eating it - it is not cooked the way I ordered.

I guess I know how tough the business is and so if it falls within "acceptable but not what I wanted" I tend to accept it.

However, we do have a "three strikes and you're out" rule. If a restaurant messes up food or service or we are not happy for whatever reason...that restuarant comes off the list.