Dolph wants to direct an historical war movie, this was more fantasy / action à la Rambo meets Robin Hood / meets Mad Max almost, weird combination. The final movie is also very different from what he had signed on. He and the director were pissed when they got on location with the producers waiting for them a new, more simplified script in hand. Dolph likes more realistic stuff, he's not really into supernatural-type or fantasy stuff. What I could see him doing that more up his alley is maybe something more in the vein of MEN OF WAR maybe.
For me BOD is not one of his highlights, it's a guilty pleasure but it's very cheap and cheesy, not so impressed by the fights either (not a big fan of Florentine's style, weird close-ups and Power Rangers-like stuff and sound effects) which I know are a reason why so many people actually like the film...