Guinness is bitter, but more like black coffee or unsweetened chocolate, it has a rich flavour. There are lots of really bitter beer that are watery, but still better. (Canadian comes to mind, though I doubt any of you guys have had any.) I like Guinness because it has that dark, roasted, creamy and full flavour to it. Plus, I really like unsweetened chocolate, and sometimes drink my coffee black, for the hell of it.