Well, it's really easily explained why some people think White Mage is "bland". But it's more of a player issue rather than the class itself. I'll just quote myself from the second or third page:

Quote Originally Posted by Lyrica_Ashtine View Post
Here's some more about the average duty-finder-hero White Mage or never-raided-but-a-soldiery-hero White Mage. Such as followed:


Thing about White Mage is is that you do not learn a thing about healing while leveling from 1-50. Even less if you're one of those FATE-farmers who has never set foot in a dungeon. The average pattern in dungeons is like this:
hur dur idle till someone takes a bit of damage
press button to cure
hur dur idle some more

This is significantly more notable at low level dungeons. From Brayflox on you technically are taught to use Esuna more, but it's still doable without Esuna and still a HP-bar-filling-game and in Cutter's Cry/Sunken Temple you learn how to deal with mechanics as a healer. But this has nothing to do with healing itself in general. In Stone Vigil the mobs hit significantly harder, but that only reduces your idle time and still only involves filling HP bars without any other worries.

Once you hit dungeons such as Darkhold and Aurum Vale, the inability of healers become more transparent. Previous dungeons hasn't taught them anything about MP management and smart-casting (name pending). In lower level dungeons MP was never an issue and even if you heal a full minute late, it won't cause a wipe or anything. Taking previous 44 levels for granted, it leads to a very common thought pattern: "Not my fault". After all, for 44 levels worth everything went fine and you didn't do anything different at all, so it has to be the others, right? This is simply wrong and majority don't even acknowledge their own failure. I would like to dub this The LoL-effect.

The moment you reach level 50, you're being tossed into a lion's pit without being taught anything but filling HP bars. The learning curve for white mage turned from a flat beach to a Normandy invasion scenario. Healing simply became too hard as a white mage because you're always three steps behind and too dull because they're still doing it like they've done from level 1-49.

This would lead to a very common pattern (for white mages):
Divine Seal is never used
Eye for an Eye is never used
Presence of Mind is never used
Shroud of Saints isn't used till very low on MP
Regen/Medica II are up for no reason (no enmity mechanic awareness)
Virus is never used
Fluid Aura is either overused or never used*

With this, almost everything a white mage has to offer with it's skill set is being denied. No wonder it's dull if 80% of their skill set isn't even used properly!

* Fluid Aura is a 150 potency ability for free! Use it wisely as it can cause annoyances on targets that can be knocked away