I still don't understand what you mean by the first comment, are you trying to say that only a 2000+ games player would truly know if the Zerg are the weaker race? I think Benji have a very valid comment there, the skill of the player can only do so much with the limitations of the race they are playing.
I am yet to see in any pro Hydra drops play actually work, I have seen it attempted in the last month a couple of times but every time they have been wiped to the floor. Baneling busts have been around since beta its nothing new its just that pro's stopped using it because it didn't work. They are doing it from what I can tell because they really don't have any options left.
I'm not crying Zerg are the worst they get owned all the time because that isn't the case but the odds stack heavily against the Zerg from the outset and as long as you don't make a single mistake and your APM is through the roof etc etc.. then your going to be hurting a lot more.
Think of it this way, when you begun to play Starcraft, it gave you an option to select difficulty: Normal/Difficult. If you picked Zerg, you have chosen difficult. It is way harder to learn/play but the more experienced/better you get, the "imbalance" starts getting lower and lower.
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