My AoE tanking abilities are not bad, but some times get out of hand, and lose threat. I keep TC and SW on CD, and spam cleave on targets. If there are more than three targets I click around and cleave while watching Omen to see if I am losing threat on that target. It works pretty well unless its like tanking whelps on Ony.
So I do not know about others warriors but I think warriors should get an Area of effect that stays on the ground for a certain period of time(Like Pally's consecration or a DK's Death and Decay). Because, if I am tanking something like whelps and another pack of them come out and TC and SW are on CD,who has aggro is screwed unless I pop my AoE taunt that's on a 10 min CD.