i don't know how people still says "bad art" and "good art".
people should just say "art that I like" and "art that i don't like".
there are people who like generic stuff, some people who don't. some people are mistaken enough to not to give a series enough worth just of how it looks. i pay attention more to the plot, even to the feeling a mangaka can depict in the flow of the panels.
i just have to tell to those people who doesn't like "bad art", you are missing a lot of good mangas out there.
for instance, matsumoto taiyou's takemitsu samurai is "bad art" for most of the people i had suggested the manga (some were idiotic enough to say is lack of skills xD)
http://www.mangaupdates.com/series.html?id=9962. this is one of the few mangas that i know of that you can trully say that "there is a work of art on each panel"