Zerglings are the worst unit in the whole of Starcraft. They are weak and have like no attack. In other words, they really suck. WRONG! Zerglings do not suck! Sure they are weak and all, but guess what! They are as cheap as hell to make. I mean these little bugs can be made for only 50 minerals for two-25 each. And each zerlings take up only one and a half space. You mass up a heck of a lot of zerlings then send them in to blow up the enemy. Throw in the speed attack and the speed upgrades and their unstoppable. Yes, even Reavers, tanks, filled up bunkers, and lurkers can stop them. You just keep making them and sooner or later they will crush the enemy. How about air you might say? Zerlings can't attack air. SO WHAT! You got enough zerlgings to say. Punish those airfleets by blowing up all their buildings!