I feel like locking doctrines behind a massive grind will be a bad idea. Similar to heroes of the storm when it launched, and you had to grind a hero to unlock different talents and ultimates. (which the changed a few months after release) I think the same thing should be applied here. Getting to level 3 to unlock another doctrine is fine, because that only takes a few longer games to get to. But getting to level 8 to unlock it for the army will surely be a must have with certain doctrines, simply because of how powerful some of them can be. And thats going to take days and days per elite, which there will certainly be many of post-launch. I'd prefer it just be unlocked right away at 3, and level 8 have some sort of skull reward or w/e, because this is going to put a massive damper on any competitive nature of the game, and discourage a lot of people from playing, when they see the grind they have to go through for an ingame benefit.