We have Reh'gar... only because someone at Blizzard opposed the "support kit" for Thrall, and they quickly made Reh'gar.
Now Rehgar acts as skin wielder of of more iconic Orcs like the Santa Clause Orc in Orgrimmar, or big boss of the Frostwolves Drek'thar.
I wish Blizzard made Drek'thar instead of Reh'gar or if it's not too late, perhaps make him a ranged Elemental Orc. Let him ride his wheelchair. Not only is that funny (and badass), but that way you can see the difference between Reh'gar Drek'thar skin and real Drek'thar.
This Orc looks different enough to be his own hero:
https://www.youtube.com/watch?v=CkIveH6YLfM