Clone2. The guy pretty much just went up and down the help threads just to increase post count. Most of the time his posts were irrelevant to the problem. Sometimes they were counter productive.
Iban. We all know, no explanation needed.
Zapk. Woo'd all the users by stuffting a fountain of stuff add-ons. Maybe a couple of them were pretty neat. Some of them also had backdoors. Either way, there was just too many very simple add-ons.