If it's a mixture of Marine, marauder, helion, it really doesnt work that well, since it takes like 5 baneling per marauder and microing doesnt really work when they are as a pack. Your opponent wont always be nice enough to fight yourself in a wide open space
I think its kinda stupid how strong marauder are atm against nearly everything. The few counter require you to do something risky (tech really fast) or pull some awesome microing.
I always try to win in the first 7-8 min against terran when random give me zerg, otherwise I'm fucked if the other guy is remotely good.Ya if they are just going heavy marines/marauders you should just go lings/banelings, you should be able to bust down their front door really early and once you're in those marauders/marines will die to lings and you can mess up their econ.
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