There's no doubt that the simulation is a bit arbitrary, and the results are often a coinflip since the programmers really want to comeup with an unexpected result, but it's a fun and useful thought exercise.
Knight versus Pirate was upsetting, but it points to the educational value of the show. It's important to understand that ballistics renders armor useless, just as Knight versus Ninja showed the value of superior protection. There's no question a Spartan shield is the ultimate weapon, any history book will show the superiority of the Roman Phallanx, if only it could stop bullets.
Spetnaz was the most disputed result, but the American didn't even notice that he had missed a target, the Russian missed too, and paid a few seconds to correct his mistake. The treching tool did get the shaft, however, that weapon is a battleaxe. I think Afghanistan 1984 shows the supremacy of American determination to Russian elitism.
I'm loving the new season. Vampires versus Zombies brought about the real life smack talk that the show portrays as I passionately maintained that the most impressive list of powers was everything in the face of sheer numbers, but the surprise ending was wholly satisfactory.
In truth the bottom line in any conflict is a question of morale. 90% of casualties occur when one side breaks and runs. It is the same in modern warfare and ancient warfare. Courage is the lion of battle.