Untappd.com
Keeps track of what you've had, 1-5 stars, can add notes and where you drank it. It will likely make you branch out as you discover other beers that your friends have been drinking and gives you suggested beers based on what you like. Quite the comprehensive list of beer. Unfortunately, the downsides are that you cannot see other 'reviews' other than notes people left, the average rating from the rest of users is limited to whole stars and its not really a review site.
Its a fun little sight, kind of like a social netowrk for beer. Probably a bit too simplified for what you are looking for.