Wlad? If so, it's because he still looks vulnerable to a big punch or heavy pressure. I do feel he has improved since Manny came to his camp in 04, but more defensively, thats where the improvements in his game were made.
He fights scared and doesn't resemble notable champions of the past: he has no charisma, in or out of the ring.
Vlad fights smart, he is a boxer/puncher. World champion as pro and world champion as an amateur. Gold medal, 1996, superheavyweight division. Haters want Vlad to stick his chin out to be hit because they want him to lose.
I think manny takes the fight out of his heavyweight fighters. He teaches them to fight boring and use their size not their skills to win.