I didn't have a whole lot of success with a Bear tank in my mixed group.
Was running Disc Priest, Bear Tank and the others the same as below.
I switched each class to dps... Shadow Priest, Frost Mage, Boomkin, Elem Shammy, Affliction Warlock.

Not sure that my macro for the bear was the best, but I was using...

#show Maul
/click MultiBarRightButton1
/click MultiBarRightButton2

Button 1
/castsequence reset=combat Faerie Fire, Enrage, Demoralizing Roar, Null

Button 2
/castsequence reset=combat Mangle (Bear)(), Lacerate, Swipe(Bear)(), Mangle (Bear)(), Maul, Swipe(Bear)()


My problem was not enough threat on secondary targets. I'd frequently find a DPS had pulled threat from the tank via Chain Lightning or that the healer had via Renew + Penance taken aggro from a secondary target.

I found the Pally using a 96969 macro allows my 4x shammies on the other team to do as much AoE as they want without the ability to take threat.

Not sure that my macro is the best, but its another option to consider.