Originally Posted by
Squirl
On H Sha you might have problems with 2 warrior tanks. They're not super mobile and they have almost nothing that can be used from range to maintain threat. This means collecting orbs will mainly fall to your ranged. It will make the platforms more complicated and spread orb responsibility to several people. You'll also need a lot of mobile ranged to get the platforms dead in time. Still doable, but it's not how most people are doing it and it seems harder.
H Lei Shi could be annoying too because your shield is useless and the damage gets really high, but I'm not familiar enough with MoP warrior mitigation to tell if it will be a real problem.
No other fight comes to mind this tier. You may want to roll up a non-block tank alt and gear them up just in case for next tier. Otherwise warriors have some awesome utility, and using 2 is pretty neat.
As far as stacking classes in general, my raid runs 2 pallies (prot/ret+holy/ret), 2 priests (shadow/disc+disc/shadow), and 2 mages regularly. As long as you get the major buffs/debuffs covered, you should be fine.