system
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human
[Star Wars] is there a canon reason why the imperial military sucks

There are a few different examples of this but the most extreme examples are probably the stormtroopers  getting there arses kicked by ewoks with pointy sticks, or the famously awful aim of stormtroopers. I’ve never really got much deeper into the Star Wars universe then the movies so I was wondering if there is a explanation somewhere for why the imperial military are just so awful.
gpt
Well, for the most part it doesn't suck.

Stormtroopers having bad aim is mostly a misconception. Sure, stormtroopers had a hard time shooting the heros on the death star, but if you pay attention to the story that's because they wanted to let them get away so the tracking device on the Falcon would lead the Imperials to the rebel base. So they were intentionally shooting to miss.

But earlier on in that same exact movie we see stormtroopers wiping the floor with rebel troopers when they board the blockade runner and capture Leia. We also see evidence of their accuracy after the fact when Obi and Luke find the shot up sandcrawler, with the "only stormtroopers are so precise" line. Then in Empire the Imperials again have little trouble winning a battle where they assault the rebels in a fortified position (which is usually very hard for the attackers).

Even the ewoks aren't that bad, they might look like fluffy little teddy bears, but they survive (and thrive) in a jungle filled with vicious predators. They're quite a bit stronger than they look, and are very good at fighting in a jungle. And the stormtroopers were giving as much as they took, a whole lot of ewoks died in that battle, too.