I love using Guinness for marinades and sauces but to drink is not my favorite nor can I imagine loosing my taste buds enough to enjoy. I had a customer who loved Guinness Stout and had 3-4 bottles every night which made me buy 5 cases at a time to get a discount. As luck would have it he was transferred and I had a hard time selling the last few cases I had even after reducing the price to $1 per bottle. I guess it is similar to anchovies in you either like it or don't. I don't eat anchovies nor drink Guinness but love the flavor for marinades and background flavors.
As teens we'd drink Guinness. We found if we all chipped in and bought a six'er of Guinness and then a case of the absolutely cheapest garbage beer the one bottle of Guinness we each drank killed the taste buds and made even the worst beer taste great.