Yes he is, but some of us prefer to forget that. He never recaptured the gravitas he had in Dark Crusade. That and his armour went from ultrabadass to fail. His voice had the same problem.
I found his voice painful to listen to in DC. He speaks so slow it's almost 1 word per second.
He is pretty terrible in Chaos Rising. It's also sad to see him become Abaddon's bitch in Retribution. But he does get some great dialogue in most of the game. Plus, he becomes a daemon prince at the end of his story. So even though he becomes Abaddon's bitch, I still think he is better in Retribution than in DC. He just gets much better dialogue (imo)