I'm not sure why there is so much hate for Corso. For my Sawbones Scoundrel, he's the best tank and is great at keeping aggro. The harpoon brings in the mobs into perfect position for most of my back attacks allowing control of the battle. Even when teaming with a buddy who's a trooper, Corso make a great off tank, keeping at least on heavy mob off my friend making the healing job that much easier.
I can understand why a character relying on AOEs and not utilising rear attacks as much would find Corso a bit annoying, but he's perfect of the playstyle of Scoundrels.
I'm interested on hearing other people's points of view.