Spoilers...
Theres very few rules in storytelling but a big one is to make the threats credible, to make the challenge worthy of your heroes quest. This was Sargeras, first appearance in full form in a cinematic and hes THE big bad so they had only one mandate: make him credible. And....they got it utterly wrong.
1. They have the guy hiding in a cloud like a coward.
2. The cinematic is basically Sargeras getting his ass kicked.
3. He whines and screams like a baby.
4. He gets jailed and now illidan is going to kick his ass for eternity.
5. Sargeras kills ZERO lore heroes on his way out.
6. Velen, Khadgar, and co actually look BORED watching this play out.
Now, it might feel really cool to you TODAY to see this. But this irreparably does damage to the lore. You see, Sargeras’ victories are ALL off screen, rumored, little to no corroboration for any of it. THIS is his FIRST screen time EVER. that means going forward THIS cinematic WILL define who Sargeras is. For the next 10 years, when kids ask “who is sargeras?” People will tell them to watch this video. And they will come away with the impression that Sargeras is an inept stupid moron that loses despite his massive size. In short, his lore will be dimished to that of an imperial stormtrooper over time.
Some people should be fired for this cinematic. They had one job. And they blew it.