Sounds great to me! A group of fanatics who have gone out of their way to maintain their ideas of perfection throughout history and are looking to kill everything and everyone, including themselves, in order to unmake the world so they can return to godhood is a million times more interesting to me than...a tyrannical political group. Ugh.
I'd rather have the political group, they make sense thank you very much. Having a hardcoe group of fanatics like that is fine, but having them over-represented to the point that they call all the shots and control everything stretches credulity, it would be like claiming Al-Qaeda or some other extremist group controlled the entirety of the middle-east because a few nuts are in the habbit of blowing themselves up.
Going by your standard Beth should have just made the Stormcloaks an occupy Solitude movement with tents, 'we are the 99%' signs and all too, you know to keep things nice, simple and clean for you. After all one can always use more time to ponder the implications of whether Sovngarde is the remnants of Lorkhan's daedric realm or some pocket of Aethirius where the strongest souls manage to avoid the process of reincarnation, recycling and ultimately destruction (since there is no perfect reincarnation in TES, save perhaps the Nerevarine).