We're in a exciting but uncertain place at the moment Blizzard has pledged to continue development and balancing on Starcraft even after release; and I believe they will succeed and Starcraft will be balanced. In time.
Which brings me to my topic. Starcraft 2 Legacy of the Void has some very clear balance problem, yea the ones that your thinking of right now. Those imbalances exist they do I believe it so does any other thinking man, but I don't consider it a problem because I know it will be fixed "eventually".
I've seen so many of my fellows shaking their fist at the sky because of overpowered units strategies attacks etc. and it takes a toll on me and I get more angry at them then I ever could be at Zerg, Protoss, or Terran.
Here's the thing I've been laddering trying to get used to the new economy of legacy(I'm a Terran player). And I've been having trouble with Zerg; actually it's a match up I've struggled with for a long time I've never truly been good at it. I've been getting hit with a specific timing and it kills me every time but the thing is I look at the game and I see I'd been making mistakes. Chose to build a second armory when I shouldn't have floating some money before the attack hit. As a player I've come a ways and it should be clear to anyone knowledgeable about Starcraft that 15-25 supply more and I hold that attack easily.
My point is that I am by far not the best, and I am very grateful for that. If I'm not the best it means I can always improve myself and make myself better then maybe one day I will be the best(Maybe). Not everyone can think this way I understand to those people maybe you should come back to Starcraft at a different time cause yes at this time the meta is very unstable cheese is common as it is at the beginning of every expansion and on top of that the balance isn't there yet.
As for me I've never enjoyed Starcraft more than now. Every imbalance a new enemy to beat and a long way road to the top.
Gl hf