Hmm, a good beer to me is dark, sweet and with a bit of bubbles. The British ones are ok, but too flat.
A stout with a fuzz, that'd be good.
Newcastle Brown Ale is a sturdy good brew. - Easy to get too, so often my beer of choice.
Erdinger Dunkel is very good.
A number of dark, typically christmas inspired, beers are supreme.
I'm told that my taste in beer favors the traditional Czech beers, where one of the tests to see if it was ready, was to take on an apron backwards and sit in a chair where the beer had been poured over. If the beer was sticky enough that the chair lifted with the apron, then it was ready.
If not really partial to the Danish pilsners like Tuborg and Carlsberg, although Carlsberg have, in recent years, made several other kinds of beer some of which are fairly good.