Refs and judges who backed him. He could hold an opponent so much he makes Vlad look like an all out brawler, yet he would never get warned. He could hold when ref said Break, and just keep holding till ref pried him off, never a point deduction. He got many decisions he was not deserving of, so often it started outraging even some supporters.
Technically, his jab, though. I've never seen one that fast without pattern or telegraphing, that struck with that much force and damage. Its the perfect jab. If I had Muhammad Ali's jab and the rest of my weapons and weaknesses, I'd be a top 5 heavyweight. It's the perfect jab.