It was too OP and needed to be nerfed. While I disagree with shield bash's base damage from almost 220 down to 80 or 80 damage, I agree with the other nerfs (i.e., jewelry stacking and increased down-time between bash's).
For all of you complaining about not having good DPS with sword and board I have one thing to say to you:
S&B is NOT meant to be a DPS weapon, it is meant for tanking and damage mitigation. If your attack relied solely on shield bashing for damage then you need to re-evaluate your play style and gain some skill.
As a DK who mained in S&B for tanking, this nerf has also hurt my ability to dish out damage with shield bash. What did I do? I changed my skill bar and made it work.
This is an evolving game and things will continue to change. Instead of crying about how you can't do what you used to do, try something else and make it work.
People are whining that they can't handle mobs of 4-6 NPS...well news flash, you shouldn't be able to.
If you want a cake walk game, go back to playing WoW.