@Tumdance - yes our threat per damage is much higher than other classes. Blizzard knows this as well. However, they aren't going to do anything about it until 3.2 at the earliest, and 3.3 at the latest.
Reasons:
1) Too many tanks are gearing avoidance. Thus the problem isn't you, its them.
2) They know what gear levels will be in 3.2, 3.3, and beyond. It should not be an issue now, but it will be in the future.
3) They have mentioned time and again about nerfing tank avoidance due to "You have high avoidance, thus the boss needs to hit harder" inflation. How do you tell someone "You should be gearing for threat" then nerf their avoidance? My guess is that they will buff threat, nerf avoidance, and let people continue gearing for avoidance, and maybe try harder for 4.0
4) The fights we have the most threat issues on are the fights with buffs or minimal participation from us (patchwerk-esque). Tanks don't always get these buffs.