Final Fantasy Hacktics

Seeqs suck no matter what you do with them.  Earlier in the game (as if you can get it particularly early), Reverse X-Potions could deal 400 damage a pop with them, but depending on how you level the rest of your characters, that stops being particularly impressive.  Ultima at least *should* surpass it and you don't have to maintain your inventory to use it.
Assassins aren't goddesses of death anymore.  They are just really awesome.  They are built far more like versatile glass cannons in this one.
Paladins took a similar but different hit.  They lost out on a bit of attack power and now have growths more specialized to being the tanks they are supposed to be.
Most jobs are at least moderately useful in some fashion, even if that is only when used as secondary skillsets.  That said, each race tends to have one or two jobs that are the best for stat growths, and sometimes the best to use.
* Melee humans are best leveled up as Parivir at some point as they max out their physical attack power that much sooner.  Leveling up purely as one is a waste, their PA growth is so high.  As for abilities, this is the closest job to being completely broken in power.  Forget dual-wielding as a human, these abilities are just as powerful and don't restrict you from shields.
* Other races make better mages.  I don't remember the best human growth for MA, but Seer is by far the best one to use... as a Secondary ability set that is.  With Illusionist, you can hit all enemies with both a magic attack and a melee attack... with a crappy weapon of course.  Used with a Ninja with Dual-Wield, they can deal much more damage than most ranged fighters, always have enough MP to trigger Magick Frenzy with a ninja spell, and have a chance of causing a nasty status effect to any enemies that survive.  With Paladin, Parivir, or Blue Mage especially, they make far better Red Mages than actual Red Mages do, minus the double-casting.
* Blue Mage is by far the best job for well-rounded stats.  Its growths aren't high enough to max any of their stats unless you get lucky, but all of them get close enough that it really shouldn't matter.  Stat-wise, they are the jack-of-all-trades but master-of-none, but only just barely, literally.  Heritor is ever so slightly better, but only one character gets that one.
* Nu Mou should level as an Alchemist whenever possible.
* Viera, interestingly enough, are best leveled as Summoners, Assassins, or Fencers.  Assassins are the most well-rounded (and fastest), but are very squishy.  Do not level one as a spellblade.  Despite being an advanced class, spellblade's growths suck compared to Fencer.  Green Mages are a good alternative for MA and Speed growths if you don't like to or don't want to use the speed reset leveling trick.  Using them as Red Mages, Snipers, or Assassins tends to work out best.  Snipers make a very good combination with Spellblade abilities if you like using status effects.
* Moogles are best leveled as a Time Mage for MA, if I remember correctly, or alternate between Gadgeteer and Mog Knight for well-rounded-ness and possibly maxed or close to it magic defense and physical defense.  Gunners are still a good choice to use with Ultima.  The new jobs suck.  Jugglers are still haxx.
* Gria should be leveled as a Raptor for offense or a Geomancer for defense.  Not much point to build one around defense though.  They can never max MA that I'm aware of, but they don't have many spell options to begin with, and Raptor is the best for MA too.
* Don't use Seeq.
* Bangaa have some more leeway.  Trickster is definitely the best for a spell using one (can be done, but certainly won't be your most damaging caster), but Dragoon or Master Monk are better choices for a physical fighter.  Master Monk tends to be fairly awesome for whatever you use it for.