No Fuck Garrosh He deserves to die. He is an idiot who cann't that despite the obvious difference Sha and Fel energy is Bad and corrupting. It's like being mentally colour blind to that simple fact bad is bad and choosing a different kind of evil does not make it right to use it or even "good". But the Biggest difference between Him and his father is that his father in WC3 ACTUALLY APOLOGIZED to Thrall for fucking up and getting hooked demon blood for a seconded time, Garrosh on the other never no even once realized were he messed up and keeps on making trouble to fuel his messed up ego. Garrosh is a foil to his own father because his is the incarnation of the Alliance view of his own father along with all the bad thing that his father represented.
The difference between father and son is that Grommash lived up to his name at time and had a perfect understanding of honor and true wanted to redeem himself and his race for his mistake while his son only lives in a shadow of dead legend and has tainted it with his deluded view of it and no true had a sense of humility or gratitude.