Felt more like he was having fun torturing Sargeras rather than being forced to suffer for his actions.
I bailed out of the MCU pretty early on due to how bad it was (combination of poor writing, poor acting, forgettable music, meh aesthetics, etc) so I don't know what else he has done. I think he might have killed an entire army in the second Thor movie? I don't know.
It is possible to have a protagonist who is unrepentantly evil (The Black Company series of books about a bloodthirsty mercenary group of stone cold killers and robbers, the Rance series of VNs about a barbarian conqueror and a serial rapist, etc), but those narratives don't pretend that the protagonist is ackshually a good, righteous hero we should cheer for like Blizzard constantly tries to do.