Some of the issues. Not all of them.
A lot of the time it is just a fixation on one aspect at the detriment of others. That makes simultaneous stories weird. I think a lot of that stems from still approaching story boarding/writing like was done for the RTS which were consecutive episodes, not events at the same time. So, they story board out one story and then when they need to write the other things they have to try and fit them in around what they were telling.
Some of it is their biases. Some of it is just rule of cool getting in the way. Etc, etc.
And some of it is just the nature of an MMO limiting the way a story can be told.
Point is, it is more complicated than just saying ‘Blizzard is bad at X.’ They have a number of problems that cause some stories to fail. Overall, most of it is generally good. But they have fails. There are certainly bad stories. But the causes vary from one bad story to another.
It is worth having discussions about specific failures and the causes. But you need to be careful not to lump all failures under a single umbrella.
Good and evil certainly exist. And there are certainly situations where there are clear lines. But, the reality is that people are not all good or all evil. Good people sometimes do bad things for bad reasons. And even terrible people will have some good. People are grey. And some choices don’t have an obvious clear good/bad answer. And people, being grey, will sometimes disagree on what is the right answer. So, the world we live in is grey.
And our fiction is typically a reflection of our reality. So, we should expect that fiction would tell stories of people and things that are some level of grey. So, in our stories, good groups (like the light) will have some that do bad. And even among the shadow (bad group) you find some who do good. Stories are grey.
My argument would be: Yes right and wrong exist. But nobody in our lives is all one of the other. So, why should the people and groups in our stories be all one or the other?
Best guess is the Naaru are the light’s answer to Old Gods. But even that is not clear. Logically at the top estimate of power that would put her around an Old God, who were no match for the Titans. Or around the power of Nature’s guardians, the Wild Gods. So, all together quite a bit less powerful than Titans.
And to top it off, it was pretty clear she was not at her full power. She had just been basically ‘put back together.’
And Illidan (who was a raid boss as well) was not exactly a slouch when it came to power.
So, the cinematic showed her in a weakened state restraining one of the most powerful characters we have dealt with. If anything is portrayed her as a very powerful character, even though she ultimately lost.