I put sometimes. I've never sent food back because it wasn't made how I expect it. I've had "meh" meals, but never bad ones.

I once ordered fish and it was only partially cooked. I wasn't going to complain (I wasn't really that hungry anyway) when the manager just happened to walk by and ask about our meals and my boyfriend spoke up about the fish. The manager was horrified and I assured him it wasn't a big deal. A whole new plate was brought out.

At Friday's, I ordered a sandwich, the order came out promptly and I dug in and then part way through realized that it wasn't what I ordered. It was really good though so I just didn't bother saying anything.