Place buttons on the Hub Hopper that alert the author and moderators to specific issues such as grammar, spelling, punctuation, poor content, too short, bad formatting, etc. They can even include a box for entering details about the error you encountered and how the author might correct the situation.
It really is that simple!
If the hub has been flagged for a specific "technical" reason (not one based on bias concerning that author's writing), such as one of the specific technical issues mentioned above, it can then be corrected and sent through the Hub Hopper once again.
In addition, hub scores (or karma) should be more heavily dependent upon one's participation in Hub Hopping.
The idea of Hubpages is that we all participate in a concerted effort to generate income and gain public exposure through a common medium. I think that is the purpose anyway. If this is the goal then I am all for doing like we did in grade school and grading and correcting each other's paper (so long as Hubpages makes sure, in today's very contentious world, that personal bias against a work does not fit into the equation).
I do recognize that some written works may not be appropriate, but I am also alert to the warnings that Ray Bradbury gave in his Coda to Farenheit 451 (printed in the 1991 edition), in which he stated that, "the real world is a playing ground for each and every group, to make or unmake laws." It is because of that statement that I believe we should all be working together to resolve technical issues, but we should allow the public at large to decide whether or not they approve of what we said.
I am not the best at technical details concerning proper grammar, but I do know how to think and I have plenty that I would like to say. I for one would welcome constructive criticism that would enable me to be a better writer, and I know for a fact that the world is full of anal retentive grammar nazis that would be more than happy to oblige (you know you're needed).