The Pankration one is the only episode I've seen so far that I thought was weak. The training seemed very much staged. There was no indication that the Champion, for example, trrained under the same conditions.
Plus, like other martial sports that have 'no head punch rules', the system trains athletes to a sport conditioned for protective rules as opposed to unarmed combat so I would say unlike the other episodes, that one went against the grain of the series title. Mind you, I earned a black belt in TKD - which also has the 'no head punch rule'. When we trained for full-contact competitions - the emphasis was on always on points and a lot more risks were taken knowing that head strikes and grappling would not come into play. There was of course other self-defense aspects taught during my training, however, I really do admire the MMA of today (wasn't around in my youth days).