I can't accept that Mankar Camoran was on the right path, though. If we follow the old proverb that "by their fruits you will know them," what should we think about the "Paradise" that Mankar created?
That it's a place of sadism and a prison. Isn't this a false freedom?
While what Saxbass said may very well be true, but to play the devils advocate I will add:
You're thinking too mortal. M was trying to make his people understand what they really were and were capable off - what seems to us (and the followers) as torture and sadism is his attempts to do so. We do not understand it, because we fear such things, and, most importantly, we fear death. Mankar's followers, however, had no reason to fear neither the torture, the pain, or death. They could not die. If they died, they were brought back to Paradise and lived again. Fear, pain, and horror, were now to them nothing more than hollow concepts - but they still clinged to them with their mortal minds. Had they embraced Mankar's "gifts", they would have become... well, pretty impressive.
One might even go to lengths and say that the line between them and "true" Daedra would have been blurred out.
But, as I said, they were too"weak" to understand this. They couldn't stretch their imagination far enough to look it from any other standpoint than their own, mortal one (little wonder, by the way), and so, they experienced it as a neverending torture.
The only two persons who seemed to have realised what the Paradise was really about seemed to be Mancar's own children, because, if I'm not mistaken, don't they automatically resurrect every time you kill them, in the final battle?
One might only wonder what he did to make them understand.