Exactly! The problem with down-voting is that it wasn't used only to voice disagreement with the content of a post. I've seen many cases where posts were down-voted regardless of how appropriate or accurate the content was, simply because someone didn't like the poster or their posting style.
It is a cowardly and immature act to down-vote a post, regardless of its content, simply because you have a personal vendetta against the poster. If you disagree with a post, at least pretend to be mature and voice your disagreement by posting, rather than hiding behind an anonymous down-vote. If you don't like a poster, add them to your ignore list, so you don't have to suffer the agony of reading their posts.