How come blasters don't shoot straight? Lots of missed shots.
Actually, depending on the level of Canon you are looking for, that's not an unreasonable question, at least as far as Stormtrooper use is concerned.
Stormtroopers carried E-11 rifles throughout the Galactic Civil War. The design was based on that of the DC-15 series of blaster rifles, carbines, and pistols which were once favored by the Galactic Republic's clone troopers. Some stormtroopers were known to complain that the original E-11 had been poorly designed to compensate for recoil, leading to diminished accuracy in firefights, and preferred the carbine model instead.1
Ok, so this was clearly a retcon to deal with the Stormtrooper effect... But, depending on the level of canon you are looking for, it could also be valid.
The, too, there is this info from a Star Wars RPG: