What is the appeal of the Gravage Hulk/Green Scar

After reading Immortal Hulk, Paul Jenkins run and the current run I struggle to find an answer to why do we keep going back to the Gravage Hulk. He's the Hulk who really cemented himself during Heroes reborn when Banner separated from the professor leaving us with him but it was Planet Hulk that made him a super star.

It feels odd having this Hulk who is supposedly a mix of Savage and Joe be the dominant and most commonly appearing Hulk when the other two have more of a defined personalities. Now even when Green scar is torturing Banner I cant help but find him kind of bland, I think it'd be more appropriate to have Savage torture Banner as he was the one Banner directly exploited. Instead it's green scar back with little explanation as to how he returned after his suppression and potential death.

I miss the other smart Hulks, the Professor, the Devil and Joe could all fill that role and I think could do more then Green Scar. I know Planet Hulk and World war Hulk were big popular stories and I understand it's Green Scar who is the strongest incarnation of the Hulk but I struggle to see why he's the Hulk always taking centre stage. What is his appeal over other Hulks?