First off, the enter key is your friend. Hit it twice to help seperate what you're saying a bit better.
The Commander. They hold the team together and give them buffs. What people don't know is that commanders normally have the buffs otherwise. Yes, commanders have huge passive buffs but are easily overwhelmed. Which is why they help their team before themselves. They come in three flavors.
So they have low health, but are massively buffed. However they can give these buffs with their team yes? That's what I got anyways.
The Prophet, these commanders get their buffs straight from the big guy, their personal buffs aren't as good as others but they make up for it by being able to heal without sacrifice and being able to preform great feats granted by their god.
So the cleric class in basic. I would like to hear a bit more about what you think "great feats" are.
The Leader, these guys split their buffs with their team. While their teams buffs are weaker they also have someone who can wade into combat and show WHY they are the leader. They can preform feats of might to terrify their enemies and inspire their allies.
By split you mean... Like a Dragon Shaman is constantly giving buffs to themselves AND their team but that the buffs granted are slighly lower than the prophet or strategist? You mention feats again. This seems like a term you should define.
The Strategist, these guys lack their colleagues strength but make up for it in their tactical strength, to them their allies are the most important people on the field. This shows when they point at an enemy and they poor soul is turned into a pincushion. They can preform meta feats meaning that once per dungeon they can peacefully resolve an encounter and gain the loot from it. (Meta feats don't give XP)
You don't really explain what this guy does. His allies are important and he points to an enemy who is instantly destroyed... I'm not getting it. Please explain a bit more.
If you mean he can call targets which allies then get a bonus to attack then... Well the other two seem much better by comparison though I'd need to actually see the system to be sure. However when you take into account that their feat of whateverness actively punishes the party... I would never want to play with one on my team. You should punish players for using an ability that is intregal to their class.
I'm not seeing how these are all one class that is split into three subclasses. They appear to have distinct play styles that none of the others share at all.
That being said I think you should expand on the classes a little so that we can see what they are fully. Just some ball park numbers. At least get the system into place.
Other than that I can't really add anything.