Um so when you and I were working out raid comps for heroic progression Im sure "Jace why o why don't you play a rdps" come up a few times. FYI finally got those 9/9 gold CMs done after your non mdps group from 5.0 would't consider me... Good times
I agree a Warrior that can pull good numbers while avoiding as much damage as possible and using ALL of his utility to a high standard is very usefull to any team. These things may seem minimal but during progression can really help out:
1. Dropping skull banner inline with the raids CDs or following on from another warrior's if you have multiple.
2. Dropping Demo Banner and using Rallying Cry when assigned by the strat and if not assigned watching your raid frames to make best use of them.
3. Using Shield Wall and/or DBTS and/or Def stance to soak/reduce damage ie Heroic Lei Shen.
4. Taunting and using DBST when a tank dies, no res left and you are 1% from a kill.
5. Interrupt god with Pummel and Distrupting Shout.
6. Kite adds around with Piercing Howl ie Heroic Elegon.
7. Many more situational things we can do which I have ran out of time to list.
The 5.4 changes to Shattering Throw and Vigilance Focus will also make them more useful to the raid.