Yeah, the ninja vs spartan showed a lot of the problems with what they're trying to do. Part of what made the Spartan (and many other warriors from that era) so tough was the phalanx, which the Spartans perfected. The shield protected the man on your left, which meant obviously you were protected in part by the shield from the man on your right. Individually, I'm sure their warriors were very capable fighters, but their true strength lay in formation. The other issue here is that militarily, your training, fighting style, tactics, and gear are going to be largely dictated by your enemy. The spartans fought the way they did because it was effective against their enemies. Knights fought the way they did because it was effective. Most military advancements are made because you are forced to adjust your strategy or gear to effectively combat your opponent. I read a long time ago, can't remember the book, so I apologize about the vague details, it was about military innovations, but I read that the French in the 16th, 17th century were fighting an asian opponent, and the fighting style in Europe at the time was fencing, which obviously leads your arm out away from your body. Their opponents, knowing this, made it their tactic to slash the wrist of the fencer, rendering him uncapable of fighting back. To combat this the French fighters innovated by creating metal wristguards rather than the flexible leather ones that were previously used. The Pirate vs. Knight was pretty dumb, in my ever so humble opinion. Muskets and other armor piercing implements are what obsoleted the heavily armored knight. A musket or pistol easily pierces a breast plate or helmet. Game over man, game over. I guess the concept is interesting, but it fails to take so many things into account, mainly, that tactics and fighting style is adapted to suit your opposition.