madscientist:
Re: versatility
The thing is, you have to have a good economy in order to wage a good war. Without the money and the resources to finance a late Classical Age war, you might as well not venture forth. I know I made that mistake when I overextended as the Great Khan himself and promptly imploded under the economic strain.
With no advantages in building Wonders or in building, well, pretty much anything other than Barracks, the Mongols can fall rapidly behind before the late Classical Age unless you're wielding some map-dependent or skill-dependent advantage that you have over your MP opponents or the AI, in which case the "versatility" you will enjoy as the Mongols are simply an expression of your superior economic management skill.
Arrayed against Genghis Khan's Aggressive/Imperialistic is either Organized/Imperialistic or Industrious/Imperialistic. With a warmongering mindset, these translate
directly into solid and sustainable gains for the war machine.
Once you've gotten to Machinery, the Romans will have put their other trait to some useful purpose as a buildup, plus the undeniable advantage they have with Praetorians. You simply choose the Wonder advantage, or choose a few cities' advantage (for Organized). Either one results in palpable gains in the war machine.
It's true that the Romans' advantages do not end in war, but they also do not end
with the onset of war. Even during war, their Organized and Industrious traits offer them advantages, all the more apparent from the uses they've gotten out of them prior to the "onset" of Mongolian power.
A war machine is not simply units and unit possibilities ranged against each other, but also the economic advantages that can be expressed as those units which you send to war. It goes without saying that a thousand city Civ will crush a 1 city Civ militarily, even with a substantial tech and promotion advantage for the one city, and we thus say that the war machinery of the Thousand City Civ is stronger. The advantage of the Roman machinery over the Mongol one is subtler than that, but it is there nonetheless.
Re: Montezuma
The fact that Jaguars can be defeated with Axes is ameliorated by the fact that they don't require Iron to be built, so come online faster than your normal Swordsmen, and can usually be therefore built in greater numbers and with less improvement infrastructure. They're an effective UU for war, in a Civ that's built for it, with a timing and potency that's undeniable. Let's not forget that Aztecs don't have any trouble building Axes themselves to break Axemen-only defenses, common enough at that early a date, and their Aggressive trait gives them the edge against most Civs on Axe vs. Axe battles.
In the same way, Keshiks can also be countered by Spears, but I don't say that that statement alone and unqualified is enough to render them useless.
I'd say that definitely, the Aztec war machine
overall and "preGunpowder" on the whole is a stronger one. If we only consider the period past the strength of the Aztec and going into the strength of the Mongol, then inevitably the Mongol will be favored, but that's a skewed comparison if I ever saw one.
Finally, I view a great war-machine as not a quick early rush (hell Ghadi can do that since he start with mining) but being able to continually make war through several ages for victory.
I, as well, which is why I don't consider the Mongols to be a particularly strong wartime Civ. There are other Civs with greater impact on the preClassical and Classical periods, and still others with greater impact afterwards. Definitely, anytime after Gunpowder, Tokugawa is a monster. Heck, he's plenty tough as a warmonger even before Gunpowder.
On the whole, their wartime package is okay, but not all that.
If the changes to their UU were made to the Knight rather than to the Horse Archer, I could see a slightly stronger Mongol Civ, and a more historically accurate appearance of their UU. Really, whoever heard of a Mongol Horde with Light Charger cavalry AND Heavy Armored Cavalry but NO Horse Archers?!?!? Preposterous.
A Knight with Mobility and First Strike would be a formidable UU.
ShunNakamura:
The Keshik ability only mattered to you
for just that one city in your entire campaign? That's quite sorry indeed. And it's a highly situational incident to boot.