Have played this game quite a bit and my conclusion is that it'll be great when it's finished.
Lots of things in the game seem broken or unfinished. It's hard to use the Target computer as this feature is broken. So, torpedo shots feel like guesswork. Only 2 or 3 subs to choose from (All Mark 7 Uboats!
You can walk around the Uboat, but why would you want to?
You can go on long patrols but you'll run out of torpedos very quickly. (Not like the larger/later uboats)
This game will be great when they release the required patches, but for now it's unfinished and annoying. The problems with internet connection have not been apparent to me.
Graphics are very cool.
Shame this does not live up to the high standards of Silent hunter 3 or 4