It wont end up bad, but it would be an average 6/10 movie no one cares about. In best case.
It had a great potential, blizzard cinematics always were top notch.
But they are not rendering it, they are just taking random actors, dressing them like cosplayers and making them play in front of the camera.
So in worst case... we can get 2 hours of cosplay stupidity.
I hope they won't change lore too much for this movie...