I have to say that I use Avenger's Shield all the time when tanking 5-mans and haven't made it into Kara or any other raid as a tank yet. Though my guild is making me the Belt of the Guardian as soon as the Blacksmith in the guild gets 1 more nether vortex.
I have around 250 sp damage before the belt and any tier pieces, i find that in 5-mans I am WAY ahead of the dps and I know from my experience as a healer the dps threat in a raid is on a very different curve. The front-load threat from AS, I have to admit, is extremely nice but the 10% bonus to overall threat will be nice too.
I suppose it would help if I actually gave you an instance of what I'd be faced with.
As it stands now, the dps rides the asses of the warriors in my guild, threat wise, during all boss fights. You constantly hear the raid leader calling people out to hold back, even if they have salv. Though in reality it could be that the dkp system they use needs to have a tank/healer clause thrown in, because truth be told, the damage your dps'ers do is entirely limited to how much threat the tank can generate, which comes from better gear? I'm assuming a lot I suppose.
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