AQ40 being the constant cockblock that it was and the subsequent fight between DnT and Tigole+Furor. Good stuff.
As for Rogues, not being able to reach DW as Mutilate, being called lazy for being a Sword Rogue, unable to do anything after being DoT-ed, and my favorite had to been drowning Horde players in STV via Sap after kiting them out to sea :), if only that was still around.