1st and foremost, to not be able to be two-hit KO'd from a boss and have to wait more than 3 minutes for the next Wyvern. (Its defenses should be equal to the Dragoons, not this 1/4 or 1/3 of it crap like in XI)

2nd, to not have the 90% of the Dragoon's abilities rely on the fact that the Wyvern is out (They should be strong without the Wyvern and give additional effects when it is out, kind of thing, not crippling weak without the Wyvern and strong when it is out)

3rd Wyvern needs armor to strengthen it just like the Dragoon needs armor to strengthen it.

4th on the topic of armor, don't just give Dragoon gimmicky traits on their armor to "enhance" the Wyvern, those should have been separate abilities/traits dammit! (See FFXI Artifact/Relic/Empyrean Body Armor for reference) In doing so with the armor, don't make it super weak just because we have a Wyvern....actually balance it to match with the other DDs.

There are probably more things I can nit-pick about but those were the big things from XI that bugged me. That said I was a Dragoon main! and loved that job more than any of my other max level jobs lol.