Honestly this game is really well put together and mostly balanced as far as I can tell. Aside from the obvious things that are coming in future patches, here are the things I made note of in my head while playing.
1. AI needs improvement, as in, AI command. It tends to just drive off to the edge of the map rather than fulfilling it's role, which is annoying when you are controlling a TB or DD and need a screen while you are busy dodging torps with a BB because your CAs aren't killing them fast enough.
2. AI cheats Torpedo detection. Even up to 20km I've shot torpedoes, just to see if the AI would react, and the BB I had it aimed at IMMEDIATELY starts to turn around. It happens every time I launch torpedoes too, even when my DD hasn't been spotted, they magically know long before it is detected.
3. Some missions feel like you either succeed or lose based on how RNGesus is feeling at the time. A.K.A Sometimes there is too much variation when you are restricted, or there is NO variation and the ships are ungodly difficult, like Krupp III 14' Armour against my 3 CAs at 30km.
I'm interested to hear what other people think.