Goblins gather in great numbers under the tyranny of an Orc leader, or in widely-varying tribes of their own. Regardless of whether a Goblin is a lackey under the heel of a domineering Orc or the member of a distinct tribe, they make for lacklustre troops. However, Goblins can defeat an enemy through sheer weight of numbers, especially if they can attack from a flank or even better from behind. Goblins prefer to attack defenceless foes and shooting arrows from a distance is likewise a popular type of attack among their kind.
They are good early on when money is a problem and gives the greenskins a counter for enemy flying units like the gyrocopters. While each shot doesn't do a lot of damage, remember, there are over a hundred models in one regiment. As such, they are best used to support da boyz on the front line and against unarmored units.