Content is at the top of the list, but grammar, punctuation and format are all important components. Any of those three can be so bad that they can negate the quality of the content.
Using poor grammar, punctuation and format when building a hub is like being a craftsman trying to build a cabinet using unsharpened tools of poor quality. Even if the materials and design of of the piece is good, it will not turn out well. The parts wont fit together well, the finish will be uneven and the details won't be sharp.