Everyone needs to lower their torches and pitchforks. Being worried about certain things is perfectly fine, so is voicing them.
However, you need to keep in mind what we've seen change mechanically from the beta in recent Kombat Kasts.
Fatal Blow cooldown was increased from 6 seconds to 10 seconds. One of Jade's strings pops up the opponent for a combo to help with her midscreen damage.
There may be others, or there may not be. Either way, even if this is a small list of examples, it should be enough to let you know that NRS either already intended to address these issues in later builds or listened to feedback from the beta and changed them accordingly.
Give them credit. They've released some truly broken shit before, but it really seems like they're trying their best to balance things properly.