On a group of 3 or 4 mobs, you need to be using HS on the proper mob. That means you need to pay much more attention to which mob you are hitting. Frost and Unholy can basically tab without thinking about it. A build that takes the Pestilence glyph will use 6 abilities per rotation. That cuts things VERY short comparatively. If you have to run to a mob, you may very easily lose threat. And not finishing your rotation in the 10 seconds isn't just delaying damage--you risk your last HS doing 25% less on top of the delay.
Blood's margin of error is FAR smaller than the other two. You ***** up your HSs or BBs, and you probably will lose hate. If I don't BB once as Unholy, I have no worries because my diseases and DnD are already putting out way more threat.
Oh, and Blood's BB is only going to do 17% more than Unholy's in most Heroic scenarios.
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often enough not following an optimal rotation isn't even going to make you lose aggro)
You are making a big oversight here. The OP, as a new tank, will be running with highly geared players. Even WITH the optimal rotation, he may be losing aggro. So there certainly IS a big probability that the 200-400 TpS that you lose from using BB instead of HS can defintely result in a DpS getting hate. I can put out 5.5K-6K TpS in Unholy, without worrying about it. And I still occasionally have to worry (especially if running with an Arms Warrior).
I'm not saying that Blood is bad (I wouldn't argue that). I'm just saying that Blood requires you to know what you are doing, and it is going to punish someone who doesn't very harshly. Blood and Unholy get quite a bit more passive Threat due to their diseases, and HB makes it up for Frost. Plus Unholy gets more damage from DnD. That makes it much more forgiven, so you can focus on learning to tank instead of learning the perfect rotation. Someone who is trying to learn to tank as Blood just has much more to worry about.
Edited, Jan 12th 2010 10:00pm by idiggory