I too am inclined to believe a rating (though it is a median of a voted number), is much better for a "judges of character" then the post count. If you see a user with all 5 starts, one could assume either the user is very helpful, and accutate in the advise they gave, or bribes all the users to vote for them >:P..

grin
EDIT:

In addition..

"... or posts a "rate me" link in their post"

j/k raccoon