No one can *decide* what is good or bad art. This is a free-for-all, open-ended contest where contenders have no other authority other than to *insist* their view is right and hope that their powers of argumentation (and/or ridicule) can influence others.
As I said, my opinion is that corporations have the most poisonous impact on public aesthetics today, contributing -- via hideous logos, vapid architecture, etc. -- to so many butt-ugly communities from sea to shining sea.
Carl