I don't think any of the posters here quite realize the mathematical pit you have fallen into. A quick review: every time you swing at mobs, you generate hate. Since there is no damage bonus, your threat per second is purely dependent on your weapon ratios. In this case, the Dragonbone Shard has a ratio of 0.5 (13/26) while the Green Jade Broadsword has a ratio of .44 (11/25). This means that the rogue is generating more threat per second.
So, your warrior goes to taunt. But even if it works, he only moves to the rogue's level of threat + 1. So after 1-2 more seconds of swinging, the rogue is on top again. The only way out is a successful evade, and presumably that isn't happening much as the Rogue's hide skill will be low at L14. All of this is true
even without backstabbing which of course only makes things worse.
The long term solution is to level up, which will increase the Rogue's evade chance and give the warrior access to some proccing weapons that don't suck (Frostbringer, Sarnak Warhammer, etc). At high levels Warriors don't have trouble holding threat vs Rogues; its the casters that are trouble.
In the short term, try buying a Fist of Zek and Jagged Long Sword (both 16/30, .53 ratio). As long as the Warrior's weapons have a 0.01% better ratio than the Rogue's, you should be good until L28 when the damage bonus kicks in. And my evil twin Kaev's point about rooting is spot on.
Also, are all your toons dwarves? If so, that's just
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