I used to hate Garrosh since that fight. To be honest - I didn't read book so I thought that it was all orc's plan to use poison. After reading few pages on wiki and watching some lore videos on yt I know that Garrosh had no idea about Magatha's plan to kill noble tauren with poison. Because of that, orc may not completly deserve for all that hate. Still, that day horde lost one of the most glorious champions it ever had.