I really tried to like this game, but I find it not to be immersive. It feels to me like you're in charge of a very sophisticated underwater drone. There's no atmosphere to the game.
I get that there's a lot of strategy, and you certainly need to be very skilled to play it at the highest level and survive, but it does nothing for me. I much prefer the cat and mouse experience of the far less sophisticated WWII U Boat encounters in the Atlantic, where I'm part of a crew fighting for survival.
I will therefore patiently await the release of UBOOT.