Ehm... excuse me blizzard aren't you maybe by chance forgetting who Kil'Jaeden is? This dude is like top 2 in charismatic villains of warcraft. He is by far the more recognizible eredar and basiaclly the right hand of Sargeras. He is involved in a lot of shcemes during warcraft history and he is also basically the creator of the lich king and the Frozen Throne. (and don't get me started on Archimonde and Mannoroth, they was treated like stupids too)
Then why all we get is a patch where he is the end boss with no build up to his defeat whatsoever.
The end cinematic is nicely done as always, but the Kil'jaeden character is treated completely different then what he was. You just go there, defeat him, he tells Velen he was envious of hima dn that he didn't think the Burning legion could be stoped, then dies. Are you for real?
This dude should show no redemption by now, Kil'Jaeden has already shown multiple time that he thinks we all live to serve , and in his case his vision is to serve for Sargeras and the domination of the legion.
So overall i think his whole character got fked up quite badly considering how important he is to the overall WoW lore.