Rangers have raid wide (rather; everyone who hits the target they have buffed with "Marked Target") weapon dmg buff. Barbs have group wide buffs tho, but mostly in Zerker tree.
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So tos, bs, demo, conq, ranger/barb it is.
as rare as they are zerker barbs compensate diminished dps by buffing up group considerably with weapon damage buffs, reaver helps with some buffs as well group.
but both a barb or a ranger have group tools wich make them nice to have in groups always both pvp and pve.
Nothing more. It's all I need. I'm used to two kinds of main tanking group in raid. First is:
2xDT, Guard, Demo, BS, Barb - for one when you need to switch aggro so all tanks get their share in stacking Sadism/Venegance
DT, Guard, Demo, BS, PoM, Barb - for one DT solo tank aka Zodiac, so extra hit rating may be handy when debuffing for some reason is slowed/has to be skipped
One day I may become more friendly and give my demo tos, but not yet. I don't want them to sw too much ;)
Not to be... weird.. or anything, but I run around with close to 22% hit rating on my DT, I really don't need another 2%/5% (depending on if the PoM has specced more hit rating or not). The mana tap from the ToS feels like it gives more. On the other hand, the group wide shield (10%/20%) from PoM is pretty nice for Oh-S**t times.