I mean, compared to the other stuff we've fought in the game, he isn't really that powerful, he's just an orc. The only way I can see him being a great challenge is if he's possessed/infused with power by the sha or something of the sort.
Do we know if that's going to be the case? because if it is not then It's not really going to be a very epic fight, just a load people beating on an orc warrior, possibly with a few adds.
I haven't really kept up with the development of the story for the last couple of months, my sub is frozen for now but I am planning to come back to see how the story concludes.
It just seems to me like he won't be very hard to take down compared to some of the feats we have achieved like taking down the lich king or even deathwing.