I've gotten tremendously better after playing alott of multiplayer, I used to pretty much suck ass at it. While there is alott of massing 1 unit, you can switch up strategies to use different units that help each other in different ways. Right now I'm using a Zergling/Infestor strat, before that I was using Roaches.
humm I wonder if I saw you at schweitzer last year.... I was usually somewhere near the t-bar
. Anyways What league are you in? kind of curious how they let you just get to infestor with only zerglings.