The reason arena is currently so hard to watch as opposed to early arena is health and mana pools. The inflated stats from the power creep that has happened to the game has made WoW's PvP tedious.
Players may have been like "It's just Silithus", but in the lore the Alliance and Horde were still fighting over the zone and fighting the qiraji until the sword came down.
Why get Michael Bay? Personally I would go for Peter Jackson to make a Warcraft Movie instead. He's very well versed in fantasy and is really good at creating large-scale epic scenes
The Extinction cinematic is so fucking terrible. Not mechanically, but because it takes place like 15 years after all that stuff was going on in Silithus, and "devs" like Ion praised it because they themselves don't even know or care about their own story.