Been playing PLD lately and I do have a few issues, though they're more like personal nitpicks rather than inherent job flaws:

-The gauge, at least in Alliance raids, is straight up useless if not main tanking, this is not a problem exclusive to PLD but I don't think a gauge should feel irrelevant in any form of content (though I'm aware if they give PLD an "Energy Drain" it will become the go-to instead)
-It has arguably too many buttons: I think either Fast Blade or Royal Authority should turn into Atonement while the effect is active, and could say the same for Holy Spirit replacing Shield Lob and Holy Circle replace Total Eclipse during the Rquiescat window but not sure if the game coding allows for weaponskills to turn into spells
-Cover should have a longer range
-Divine Veil should just give the shield directly without the need of a pre heal