well I have been playing it a lot, there are some issues and bugs, some mechanics are simplified, but on the whole a very nice game:
-surface warfare is on the whole well done: gunnery, damage control, star shells, formation control, radar. Shell/torpedo damage and damage control seem about right.
-submarine and ASW is fairly basic;
playing through the tutorials and reading the manual is a must. A lot of stuff in there, the Devs may have tried to stuff too much into one game.
Still have not tried carriers, air battles, the campaign, having too much fun replaying the historical night surface actions in the Solomons: Savo Island, Cape Esperance, both Naval battles of Guadalcanal, Tassafaronga, Kula Gulf, etc.
If you are into WW2 surface naval warfare, this is a must buy.