I may be labelled an "apologist" for saying this, but I don't agree with this approach. I think that a frequent flyer's relationship with a regular airline should be like a good marriage: There will be good times and there will be bad times, but the former should far outweigh the latter.

But that also means that you accept that there will be times when things just get stuffed up, and you look beyond that to the other times when the airline looks after you in ways that it isn't strictly obliged to. There's no reason not to let the airline know when things aren't up to scratch; but if you start off by looking for constant perfection, the only thing that will happen is that you will be disappointed.