What I found most frustrating when playing my paladin was the number of buttons that were just super niche (whereas instead the Warrior in those same slots get additional combo moves and varied offensive options).

You have spells like Tempered Will and Cover which have an extremely narrow scope of usefulness. Then you have Sword Oath, which isn't bad at all but is still sorta niche and just takes up space more often than not... and even when you do use it has a really lackluster benefit from a thematic and visceral perspective. Which when compounded with the already reactive design of the class leaves you with just a very limited set of active options.

Then you have stuff like Flash which is mechanically very sound but also rather boring from a design perspective.

And there's some mechanics that feel underutilized: Riot blade - MP dump is a cool mechanic, but the only thing you have to reliably spend MP on is Flash which, again, isn't a particularly interesting spell even if it's good.

Personally I'd love to see an offensive MP dump of some kind. Or a third hit in the riot chain. Or cover becoming a more usable skill.