Not a good idea, Imo.
1. I'm sure axis has other, more important things to do intead of playing adventures to make sure they are not stolen.
2. It would take WAY too much time.
3. Downraters usually dont have a reason, except jealousy, wanting to get higher on the MPN, etc
4. Even if downraters HAD to tell why they downrated something, they would just, "LAME!" or soething like that.