Fix paladin. Only Class in the entire game that cannot...

[Reynhart]

What difference does it make whether you Rampart someone else or take the blow yourself with Rampart active, except that you have more base mitigation that most and would have access to the enhanced versions.

Because sometimes, you're not the one tanking the boss...
You could put it on top of a Vengeance+Inner Beast or ShadowSkin+(DA)DarkMind combo to achieve high mitigation without automatically using a 3min CD...and staying in Sword Oath.

As for Sheltron, I also think it should be an AoE conal block, so it could intercept a blow not directed at you.

In my opinion, they should have had the pld face off against a band of the arrogant ishgard knights that only care about their own glory and victory instead of protecting the innocent/common people of Ishgard.

You mean protecting an innocent againt temple knights ? Welcome to DRK storyline.
Wouldn't "The Knight and the Maiden fair" be more suited for a PLD quest ?