THere are so many other factors in the pub situation - how bad the beer is, how bad in comparison to the normal quality of beer the pub provides, how well you know the landlord, the manner in which you complain if you choose to do so. As a barman I would always change a beer if asked, if they cause a fuss and the beer is fine, I would offer something else. If they still cause a fuss then its their problem!

On a random rant, I went for a meal the other night with my girlfriend and 2 friends. The service wasnt amazing but the response by one of my friends made the situation very awkward. Getting a beer topped up that was about a millimetre below the measure line, moaning when the courses were brought out early, triple checking the bill and moaning about price, all made what would have been a reasonable meal into a pretty crap evening!