Like Sanctume said, being uncruchable is not an issue in Heroics, it's not even on the table, all you really need is 485 (490 against level 73 mobs) defense to be uncrittable. And while we are on the subject being uncrushable is impossible, due to various reason, mostly because of poor player reaction and server lag. I never use shield block, at the level of gear I have I don't need to use it, gief rage!.

With tools like the shield spike and the sporregar shield a warrior can hold aggro on 7 mobs, all it takes is pratice. and for the record that a warrior tank is crap without CC is just plain bullshit I hate to use CC while I tank in pugs etc, with CC the run takes so much longer, my way, pull>dps>next pull and so on.

My post was never about the fact that warriors are better tanks for a Multiboxer, I'm leveling a paladin atm. My point was that while the paladin are great tanks I think that warriors and druids are viable alternatives.

So dust of your warriors and give it a try, loads of action