To separate good products from bad? To find the best wine, beer, CMS system, programming language, cities to visit, video games to play, websites or even banks

To separate good products from bad? To find the best wine, beer, CMS system, programming language, cities to visit, video games to play, websites or even banks - all based on user-contributed votes? To engage in discussions around the stuff in your life you care about? I can think of a lot of reasons you could be motivated to start using a social list site. Thanks for the input :)