The one bad style of music is death metal.

no everybody has a different style of drawing!!

Of course there is bad style, just as there is good style. Bad style in writing would be poor grammar and punctuation, confusing passages in the story, and just plain boring work. Nowadays, you're going to see much more bad writing since everybody can publish on the internet without going to the bother of getting their writing edited and improved. Style can be improved with practice and effort.

He did not have a very good leadership style.

Death Metal is an excelent style of music.