I tend to lump beer into three categories: Fine (Edit:Of superior quality), OK, and Terrible
Terrible has three subsets, and they are not all cheap gas station beers. There is terrible - burns my stomach (Sam Adams/Yuengling). There is terrible - way overpriced (Heineken/Some African Malt Liquor I Don't Remember). Then there is terrible - Dag Nasty.
My all-time Dag Nastiest beer used to Stella Artois, but it turned out I just got a bad can of it off a street vendor in Budapest. It has quickly been moved to the fine category for beers to have with dinner.
My new all-time Dag Nastiest is Old Peculier. It was like drinking a beer from some sweaty guy's ass crack. I haven't been brave enough to try it again it was so bad. So I have no way of knowing if I got a bad bottle (see Stella above). But that is my vote.