I had a thought on how to fix PW:S for tanks... feedback is of course always appreciated!
change the current talent Improved Power Word: Shield from 5%/10%/15% increase to damage absorbed to something like this:
Increases 3%/7%/10% damage absorbed, and 1%/2%/3% of damage absorbed is returned as rage/mana/runic power/energy to the target.
So, for example, a normally 2000 point shield would be 2200, and would give a tank 66 rage after all the shield was absorbed. Not a ton, but it would quit the "Stop shielding me" whine.