Tbar provoked reactions from me years before I started posting here so I'd say he was a "good" bad poster. On the other hand, I'd audibly sigh whenever I came across an MSU post and eventually just stopped reading them so I'd nominate him as double bad.
For myself, I think I've progressively been getting worse as a poster, increasingly engaging in trollish and bullying behavior. Something I said I wouldn't do when I joined the boards. You either die a hero or...