Admittedly, the Zerg average pretty low on the think-meats, but they are commanded by what is, essentially, a huge brain, with smaller brains to back it up and help organize things. They aren't tactically inept, so you'll be seeing tactical ambushes and the like. Second, the X-com aliens are hardly anything like a mix of all the aspects of the 3 SC species. They use weapons, sure, but that's like saying Terran = Protoss just because both are known to use technology. The XC aliens have some mind control abilities, but lack the massive destructive power of SC psionicists, like Protoss Templar or Archons. They are like the Zerg only in that they tend to be monstrous in our point of view. If anything, they resemble the Terrans, with a heavy reliance on technology to augment their frail fleshy selves. This may be different in Apoc, I haven't played that one. Finally, my point wasn't numbers(though that plays a role) so much as scale. In any given game, I never hear of huge world-spanning battles between humans and aliens for Xcom. Over decades of trying to conquer our world, they use small-scale combat to the exclusion of anything else, such that a tiny covert group ends up grinding them into dust in the course of a year or two. Even if we multiply the scale of the Xcom battles times 10, that might be 100-200 people killed per skirmish, with 100-150 soldiers battling 200ish aliens. A single SC map might easily involve 5 to 10 times that number of Zerg, not even bothering to adjust for gameplay reducing the scale to something more manageable for the players. Call half of that easily killed zerglings, and you still get 2.5 times the number of aliens in real, genuinely dangerous Zerg. Most Zerg aren't melee either, really. Zerglings and Ultralisks. End of list. And I'd like to see you take an Ultralisk with a sword. Seriously. I'll give you your choice of armor from the Xcom games, even. And even if you do rely on your ranged firepower, how are you going to detect a Lurker ambush? What about that Devourer trick which blocks all ranged fire, preventing you from hurting even the puny zergling? Or his 80 or so friends. Or nevermind Lurkers, what about the fact that *any* Zerg can burrow into hard, tough ground and pop back out at will? Suprise! Earlier someone was arguing that the Zerg air was maddeningly slow compared to even modern aircraft, and easily outranged by alien UFOs. I seem to recall the Protoss glassing a world from orbit with their air-power at some point. In gameplay, no given Protoss ship has "nuke the enemy from wherever you please" range. I'm guessing they scaled it down a bit for gameplay. Call me crazy, but I don't think Wraiths are slow, clunky things that barely manage to get from point A to point B. Or Valkyries. Etc. It seems ridiculous for the Zerg to be fast as fleshy, squishy things, but if a Chryssalid can take a Blaster-Bomb 5 seconds after birth, I'll take mach 5 Mutalisks. The Zerg are shooting for that whole "peak of evolution" thing, after all. Scourge might not move at light-speed, but they are *fast* little bastards. Besides, even if the aliens *do* shoot at them, their UFO weapons are almost certainly designed to destroy enemy air-craft. Take on a fly with a hammer, tell me how it goes. Better yet, take it on by throwing the hammer at it. Now fight off a swarm of bees with your hammer. Bring friends, to help or take pictures. 3 stings and you're "out". That sounds kind of fun, actually, but first I need a stupid "friend" to give my idea to. And a camera. ...I didn't mean to type so much. I swear.