I would recommend intensive testing on crit rate modifiers before going out and obtaining all of the items just to be potentially disappointed. Anyhow I don't always play WAR, but when I do, I'm tanking marshal. All I can recommend is wait for the soldiers to come up and use AoE WS. If one of them doesn't crit you're just extremely unlucky lol.

Really though, WAR shines when tanking multiple mobs at a time.