Thank you KarmaGirl for your explanation

You are right; I know that "Not everyone will like my stuff, while others will love it".
You think it is normal and not malicious if someone put 4 after he see a 10 for a wallpaper?
Sorry but I don't think so.
What you mean "didn't like the wall"?
Is it bad done? Is it because it is abstract or he didn't like the color?
Is it maybe the author of it?
I know you can't answer those questions; nobody does, but him or her.
Now, please, look the rates this person has put to the other wallpapers or to my latest wallpapers and you may find the "God" we are looking for.
The moderators don't have a lot of power any more, the approve a wall and then comes Mr. Perfect who knows all and decides which wallpapers are for public view and which are not, by giving a low ratings to them and exclude them from public view.
Any wall with a rate 6 and below is not visible to public.
Have you ever thought it that way?
In moderators we trust, they are all good artists and they understand, but not to this kind of people who are ruling in a way the site and sending away the authors with their behavior.