what is so special about spread needles?

[Bmil]

it is like a shotgun, it fires several needles, but the firing speend is way better, ppl use it because they can paralize enemys and make a block so the non paralized criatures can't hit you, then all they need is to attack and attack
a racast does not have to worry about hit, however finding a hit% spread needle is better.

so, what is special with a hit %? i have found a few guns that have that, but im not sure what it means, since i have played 100% offline, and i dont really look at guides