His kill count is extremely low, and his recourses are vast compared to other PE/NPE villains of the asoiaf universe, as even Euron, Ramsay, and the Mountain do more than him when they are a little older than him, not to mention Rorge, who doesn't have a lot of recourses.
On top of that, he doesn't even cause the war with the Starks, as it was all Little Finger planning, and he clearly didn't cause the Red Wedding.
I am really interested in what you guys think makes him stand out, or do you agree with me?