I would be hesitant to call any beer "bad". I generally find even if I don't like something, someone else will... as indeed is the case here. I would class beers in one of three categories.
Beer I like.
Beer I don't like.
Beer thats borderline.
If the beer is prepared in the most traditional and crafty ways and comes out with a perfect OG, FG, color, flavor, and consistency every time, and I still don't like it... too bad.