Lord of the North, which is the most badass part of the land. He was best friends with the new King, and was the only remaining son of the old one. and a Stark..
He fought many a battle, and won many, with Robert. Yeah, but most male characters have fought and won battles. I wouldn't call Robb a badass.
He's quite the good swordsman, Selmy said so and we all know how good he is. He wasn't spectacular, he was only a good general. He was just average.
Besides that it's all a matter of opinion, I get that.