Marshall actually hits a lot harder than princess. You can dodge his WSes but he still melees like a truck.
As far as accuracy goes, in most mmorpgs tanks aim for consistency. The term "solid rock" is pretty accurate. You want consistent hate generation and defense so your party members know how much they can damage/heal/whatever. Having your hate generation at the start of a fight get delayed because you're whiffing phalanxes sucks.