I think janie's idea is an excellent one. Case in point is a recent story called Cowgirl, one I very much enjoyed. One reviewer gave it a rating of five but stated it was a great story but the errors in it were distracting.

If it was possible for the reviewer to have given a separate mark for story content/orginality and literacy/readability then it would provide a much better indication of the overall qualities of the story.

I also agree with janie about not reviewing a great story because everything has been said before. I am reticent about repeating what others have already said and so don't end up reviewing, mostly anyway. I don't think any system would change that and it is only the rare case when the story is so good other people have already articulated most of the praise you can give.

Jason

ps I wrote to the author of Cowgirl praising the story and offering my services as a proofreader to improve it and hopefully prevent further low grades for bad grammar but as yet no response. I think that authors have a duty to at least reply to people who contact them and say "Thank you" for the praise. I think it might put a few people off contacting in the future if they don't get any feedback.