Saw Warcraft on HBO again and even though I had some issues with the end of it, I don't think we all ever fully appreciated seeing the full glory of Stormwind in all of its glory.
Thrall tried his best to create the good in Garrosh but he had little time to mold Garrosh properly. Instead he got a rushed result of that mold and it began to destroy itself. Thrall is only partial to blame. Garrosh still molded himself into the monster that he is/was today.