Here is a good example of it underhanded bagging. When you look at the thread, look at the number of posts per user:
http://www.mactalk.com.au/20/75252-d...iness-dwi.html
3 posters posting negative feedback about DWI, all first time posters (one with two posts, the other post surprisingly enough also bagging out DWI). The positive posts are all from users who have a higher post count. It's pretty sad that people resort to these sort of tactics.