I like the Good Beer Guide. I always buy the latest edition. I have it on my sat-nav, I use it on every trip. Over the years, I have helped with surveys, editing and distribution - I trust the formula.
However, every now and then it lets me down. Last week, I came across the most dirty pub I have been in for years. The furniture was filthy, the carpets too. It has had no investment for years despite being owned by one of the regional breweries. Sometimes these pubs do make it into the GBG if the beer is of sufficient quality to overcome all of these deficiencies. After all it is the GOOD BEER Guide. On this occasion the beer was close to being undrinkable too.
I suppose the guide covers about 5,000 pubs so sometimes things will slip in depending on each local CAMRA branch. I would be surprised to see this pub in the Guide again unless it receives some significant improvements - both to the decor and the beer.
I hope I have more luck this week. My research continues.