I disagree. I think what makes him unique is his ability for gurillah warfare. That's true both against the Seanchan, and against the trollocs. And I believe that's an experience NON of the other great captains have, at least so far as we know, because they were never in that situation.
I think they said it in one of the books, didn't they? He won... something against... someone... Sometime. I remember that he was described as a very good general for winning some wars or something, though I can't remember in which book it was described. I think it was Galad who said so in one...