system
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human
[SW] Is Stormtrooper armor effective ?

Doesn't seem to stop boasters at all, but is it bulletproof? Or is it simply for show.
gpt
white parts shrug off slugthrowers, barring oversized, armour piercing projectiles. The black body suit doesn't, though.  
It offers descent protection against weaker, civillian blasters, too.

Armour that are able to stop high-powered, millitary blaster, would be too thick and unwieldy to wear. It is simply not practical. What the suit does, though, is save the soldiers life.  Instead of killing the trooper outright, he will most likely survive to get medical aid, letting him live to fight another day.

Stormtrooper armour is also pretty protective against explosions and shrapnel.

Another advantage is that the suit is sealed, and offers good CBRN defense.  
Nuclear , biological or chemical spills? Searing hot planet? Deadly spores? Stormtrooper armor keeps the guy safe.

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Intimidation is a factor too, of course. The Stormtroopers are exactly that, elite stormtroopers who capure heavily fortified positions, or very important positions. They are the faceless fist of the Empire, and comes smashing down on any threats to galactic peace.