Analyse the personality of the person above you. Give them a score if you like, but avoid insulting them openly (duh)
EG: Bob is a fairly average user. I've never seen him before and he has only two posts, so it's really hard to say what i think of him. In any case. From what I've seen of him so far, he has nothing distinguishable about him. His psots are generic at best and have added little to nothing to the discussions he contributed to. However at least he isn't retarded... which is something!