LogFAQs > #926567890

As far as the story is concerned (basically, bumbling acting aside), Storm Troopers are elite soldiers. Masters of warfare. Remember, these are the guys that executed Order 66, they wiped out nearly the entirety of Jedi forces. Even the worst amongst them is a crack shot.

It's really not that much of a stretch to imagine they're giving the heroes just enough rope to hang themselves with. The Empire was actually doing pretty great right up until their leader was, literally and figuratively, overthrown by the second in command.