You can't harass members who play Face Hunter, nor are they compelled to make preemptive apologies or justifications for playing it. They don't hack or crack their opponents' game, they simply play existing cards that form a specific deck. If you suck at countering Face Hunter, you should blame the designers, not the community.
This lil' guy should also have some nice synergy with Justicar Trueheart to upgrade your newly found hero power.
Still though, as cool and innovative as this legendary is, I don't see him being played in competitive constructed. Seems like an arena legendary. Great for warriors, good for other classes. Being able to ditch your hero power for a ping or dagger seems strong.