Shields became a larger problem when they nerfed impenetrable more then anything, Look at the fact that if you have shields up you're basically running with old school impenetrable, and if you don't have shields up you're eating a huge damage increase because of Crits now. The other things added on top of it are just icing on the cake.
They are adding a new set to the game next patch designed around fighting shielded targets, Maybe that'll make things interesting again.
I can see it now:
2 piece set bonus: add health recovery
3 piece set bonus: add health
4 piece set bonus: add health recovery
5 piece set bonus: attacks on shielded targets do 8% more damage
Naw I can sework them doing this
2 piece: add health recovery
3 piece : add health
4 piece: add health recovery
5 piece: increase critical damage on shielded targets by 50%
Yup....