I agree. It's a problem with WOW TBC Gold Garrosh's character as an char. While he's described as a formidable warrior, books like the shattering suggest that his father was one. The shattering never took place. If it weren't the cheating, he might be beaten by Cairne. But let's be honest, Thrall could have taken off Cairne at that time. I do think that Garrosh is a strong warrior, but what can he actually be based on your arguments? Green jesus is not the same.
The Thrall's training and upbringing. Thrall was not exposed to real, authentic combat for more than 10 years by the time we reach this point. He led the resistance against prison camps and forged the modern Horde, and then slipped into a leadership position, which was later changed to more of a shamanistic, primarily shamanistic job. There's no doubt that he has impressive muscle memory, and may have had some sparring sessions in periodically, occasionally went out for an excursion in the company of the PC but aren't able to stay away cheap Burning Crusade Classic Gold from anything and you will be a slug. I'm sure he's skilled, but maybe not enough to fight the same or even better warrior.