I don't know if this opinion is shared but the Legion iteration of Protection is in my eyes the worst since Burning Crusade.
Focused Rage - Don't get it, it's like they were forced by knife point to replace Heroic Strike and so they came up with this dumping the damage into Shield Slam. I just don't understand the point of this, Heroic Strike/Cleave was functional and more flexible, and as a spell felt meaty where as focused rage is like a non spell, a non ability.. You press it and there is no visual or audible interaction, your Shield Slam is just doing slightly more damage. They have just offloaded Heroic Strike damage into a super expensive Shield Slam.. Really dislike it.
Thunder Clap - No longer applies deep wounds, no longer do I have the pleasure of smashing Thunder Clap as a non targeted ability to apply to all targets around me. I felt Thunder Clap had served this purpose well and I have no idea why it needed to be changed for the sake of change.
Revenge - Replaces Thunder Clap for applying deep wounds and becomes a full AOE attack.. Why? This was the meaty 1-2 target cleave, when you'd press it and you'd get a boner at the fat crits, now it's just another bland full AOE like they did to Whirlwind. I don't really understand why Prot needed another full AOE ability.
Rage Generation - Now that they have reverted to primarily damage taken rage generation it makes no sense to me that there is still rage consuming active mitigation, would be much better to make Shield Block free and have Ignore Pain (aka Shield Barrier 2.0) be the rage spender. One of the great things they did to Prot previously was make the rage generation primarily active in order to interact with rage consuming active mitigation, which meant the player was solely responsible for his own rage generation and thus the gameplay fed into itself on both damage and mitigation levels.
I dunno maybe people will not agree with me. I've loved Prot in every expansion since WOTLK but Legion to me it feels like a pile of shite.. And I'm sure it will be capable, with some gear and a levelled artifact, but god is it bland and lacking for me now. Hamstring, Intimidating Shout, Mocking Banner, the ability to talent Enraged Regen and Bladestorm.. I really miss this stuff, I'm really disapointed with Prot and maybe I'm alone but I feel they have gone quite a bit backwards from WOD in many ways.