It seems to me that Praetorians are imbalanced - notably in multiplayer campaigns. They come very early. They overpower any units until crossbowmen (which come a bit later, quite later unless they are your focus, and it seems unfair to focus a strategy on obtaining 1 counter unit.) Their strength of 8 is 33% more than the unit they replace (the swordsman at 6.) Most unique units only gain a free promotion or so that only make them useful in 1 specific situation, and this 33% is clearly the largest power increase of any UU. While the Romans must have Iron to make them, if this is the focus of their game, that shouldn't be too much of a problem. It seems that if you play against Ceasar, you have two choices, rush to ironworking to find the iron on the map to try to keep it from him or rush to crossbowmen and hope you're still alive when they show up (unlikely). Is it just me, or are these guys a bit too powerful?