Ha, PLD is pretty Borke'D overall, but just because of the constant trying to trump Ninja. Went too far, IMO.
For Ninja: I believe the main concept of Utsusemi, !Twin, etc should stay, with the same functionality, but with adjusted effectiveness. I think they will probably keep it similar, but balance it by changing the scope of the game itself, rather than nerfing the skill (more AOE, different mob abilities, less linear fighting, more mobs in general at a time). I won't play Ninja without some kind of Shadow mitigation skill, even if it is not the best for tanking in the XIV environment.
Also, staying on Ninja, I'd like to have more emphasis on throwing for damage dependency. Throwing actual weapons as an (expensive) option, of course and making shuriken and other supposedly 'common' throwing weaponry more realistic for general damage. Nothing like old ranger, but just respectable.
For Magic Damage Classes, If they are going to be outparsed by melee DPS vs. Spike later on(which is not wrong, IMO), give a bit more utilities outside of damage and/or battle to the job. Stuff like Warp, tractor etc.
For melee in general: I agree, WAR was perfect. Many probably wouldn't agree, but I would like the balancing to be something like a Ratio Tier for damage potential to damage mitigation. Nothing set in stone, as far as numbers/stats (or even abilities), but a general basis. What I mean by this is, have basically 3 types of front liners; Tank, Balance and Dedicated DPS. I think they meant to do something to that effect for XI, but just no.
Now, stuff like WAR and MNK (just examples) could be in the balanced. Do decent damage and share tanking, since WAR can switch between protector and berzerk mode and MNK has counter and high HP. BUT actually make those traits viable, even if it lowers over all dmg potential, I think its okay. I remember at some point (I quit in 07) MNK and WAR were best for DMG in most situations and more desired because they were more efficient, do to easier mitigation (but I guess thats cause of utsu lol but still, high HP).
The DPS tier can be yer usual AGI types and maybe Fellknight, however they encorperate it this time.. since it's hybrid, idk thats a different story. Let them do the most DMG and die like paper mache like they should (with the usual abilities to avoid dmg and the like, like Hide, Jump, Evasion etc). I feel like DRG/Lancer should be in this AGI/DMG/Whatever tier. Seems hard to jump with Hauberk lol Im rambling now. Forget this post haha~