Okay, I take back what I said about the Daedric Princes and their worshippers being generic. What I should have said is that Molag Bal is generic. He's just evil, and, well, that's it. Technically, his sphere is domination and enslavement, but the in-game translation of this seems to be that everything he and his followers do is for the evulz. It's just bizarre. We can at least understand the draw of the other Princes by looking at their spheres - Hermaeus Mora appeals to curiosity and the seeking of knowledge, Sanguine to base, hedonistic desires, etc. - but why would anyone worship or follow Molag Bal?
Anyway, I'm making this distinction because the game is much better when it focuses on the other Princes, which it sadly doesn't do all that often. We already know that Molag Bal is the main villain. He's the one who stole your soul, after all. We don't need to keep running into his followers at least once in every zone just to reinforce what a bad guy he is.