Is it his QQ tears of pure liquid malevolence? His masterful up-bidding of hopeful loot whores? His unflinching hatred of Psamtik? Or maybe it's the fact that he is a purple power ranger. Only Zordon knows for sure!
I play a level 70 Human Protection Paladin in the guild Invíctus on Alexstrasza-US. I did almost all of my significant pre-BC raiding on a Holy Priest, and switched to Gavel about 4 months after the expansion release.
My guild recently downed Illidan Stormrage, and we are happily eviscerating his lieutenants on a weekly basis.