Just my twopenny worth, the rating system in my opinion doesn't work, as many have mentioned there has been quite an influx of 10's recently. I would give a 10 for an image that I feel I would have on my wall at home, it wouldn't matter to me if the image wasn't totally perfect, which then inturn would upset the more technical photographers on this site.
I don't have the experience or know how to rate an image on the blog that is obviously done by a photographer with more experience than I, and sometimes I think this is where some of the bad feeling stems from, a semi pro photographer getting a low rating off of someone who definitely isn't in the same league can cause unrest.
As for the comments, that I feel is more important, comments and advice are there to help 99% of the time and I feel that my photography has improved due to the help I have received on this site. Getting rid of the rating system also will help the comment side of things, if you can't rate it, you will have to comment to get over your opinion of the image. It will stop the rating and no comment brigade.
All the Best
Gary (Gazmaster)