Originally Posted by Mækk

I think the important thing is to find the right balance between no randomness (fixed damage, no crits, no resists, etc) and the dice-roll.
Some might argue that it would be better if everything was left down to player skill. But that would mean that matches would be alot more predictable.
RNG adds an element of randomness to the game, another level to the play. A resist can turn the tables, make or break your game. And that sucks when it happens, espeically those times when that one random happening cost you the win. On the other hand, a resist or a proc can create an opening for a composition which usually wouldn't be able to win. Now you could say, if they did win, that they won, not because of skill, but due to RNG. However it would require skill to use that window the RNG created.
If blizzard can add RNGs that add unpredictability, and who are not so powerfull that they will often spell the difference between win and fail.

From a viewers point of interrest, I would say that RNGs make things more entertaining to watch. (If you can see them happening) Because it is random, out of the blue, causing an unexpected turn of events. And that is entertaining. Seeing a well coordinated skill-based win is also entertaining, no doubt, but it isn't the same. And if you can add both without ruining either, that's fantastic.