The past decade has wrought huge changes in pubs and bars. Once, it was enough to sell four draught beers and a few dozen in bottles and cans. Nowadays, drinkers want more choice. Hence, huge beer fonts with upwards of 20 taps.
But quantity is only a small part of what makes a good beer bar. The best spots keep their taps pouring a variety of styles, rather than 10 same-y pale ales. They change their offering regularly, and employ people with a genuine passion for the stuff. Lastly, they have plenty of comfortable seating, so you can stick around.