Guiness = very good. If I could get one that (loosely) tasted like chocolate, that would be amazing
There is no chocolate in the Brooklyn Stout, but, and I stake my beer reputation on it, you will never find a beer with more flavor. Deep, dark, rich, velvety smooth and jammed with flavors of chocolate and coffee.
Here's some more educated palate reviews:
http://beeradvocate.com/beer/profile/45/680/