From a martial arts POV I thought it was perfect. A common saying from Bushido is "one hit one kill," which is the ideal way of fighting (i.e. ending the fight with a single move; remember that Bushido was created in the context of feudal samurai warfare. In the context of modern civilian self defence it can be something as simple as subduing your attacker in a hold or grapple).
This is the difference between sport fighting and actual real fighting. In a sport, fights are prolonged, but real fights end quickly. The objective of a real fighter like a martial artist is not to engage in a sustained fight, but to end a fight as quickly as possible. In reality you're pretty lucky if you can finish your opponent with a single move. Think of Chess... you want to be able to Checkmate your opponent in as few moves as possible.
From a sport POV I agree. From a martial arts POV we need to remember that in a real fight there are no equalising conditions like weight or size classes. And as I've often said, martial artists _should_ train with the assumption that your opponent will always be superior to you.
I was appalled by Green's response and the crowd's reaction to Briggs' defeat. IMO there's no honour in trying to further disgrace a defeated opponent... but this just further highlights how sport fighting and non-competitive martial arts are worlds apart.