Skynet is the evil artificial intelligence behind all of the Terminator movies, and its first priority is to kill all humans. After the program took control of the world's supply of nuclear weapons, it used them to blow up a good portion of the human race. What was left of humanity lived on, only to fight a near-invincible army of merciless robots with whatever used, battered and broken weaponry it could scavenge. And yet, not only did this one-sided war "span over 30 years," instead of the more expected "one really shitty afternoon," but human beings actually won out in the end. Do you know why? Because Terminators were the worst idea in history. Here are all the reasons they suck:
They Have to Pass as Human
There are many varieties of robot in the Terminator universe, but all of the titular Terminator models are vaguely humanoid machines, some of which are coated in flesh so they could pass for people. This was so they could better infiltrate the human resistance camps and kill all combatants once inside. They were given living flesh because rubber skin just didn't look right and sparse personalities so they could make it past the gate guards. And they were made anatomically correct, because they might need to infiltrate the camp showers and possibly bone a few of the resistance fighters to lower morale before the slaughter started.
Wait, how does that lower anything?
But why bother with any of that? Skynet's main problem wasn't that the robots couldn't get past the velvet ropes at all the human clubs because they looked too roboty; it was that Skynet couldn't find where the damn humans were hiding in the first place. If it knew where they were, Skynet could just send over one of those tanks that shoots out motorcycles, or a jet with giant blades, or hell -- maybe just a good old-fashioned bomb, if it's feeling a bit boring that day.
The whole resistance movement revolved around hiding from Skynet, not just locking the doors when Skynet came knocking. Saying you needed human-looking Terminators to kill humans is like saying the reason we haven't killed Bin Laden yet is because our soldiers don't have convincing-enough turbans to get into his cave. Whatever the motive, the one thing we can establish for certain is that, although Skynet is fully capable of making gigantic aircraft and heavily armored tanks like these ...