Good Visuals and gameplay but lack of training sessions & interaction with outer world, keeps me longing for more!
You could move from any part of the world to any other, cover thousands of miles in minutes and bring the 'Titanic' to sink on your terms! Even there are easy-handy interfaces to launch torpedoes (in case you dont wish to become a naval officer).
But there is a real lack of traning sessions in the game. Whatever there are, focus on practice rather than learning. There is handy Manual after installation which can give you some idea anyways. The map is quite useful. You can lay out your own routes and follow them. But what i couldn't figure out was why ships disappeared from the map when I stealthily approached them underwater!
Theme music and radio chatter is apt with the environment, its really very real! As you come near harbours you'll find the radio streaming local channels. But what is strange is that you cannot interact with the world or even get out of the sub. Neither can you talk with your juniors (apart from orders). The game played quite smooth at 1024x768 with most settings on, in my P4+ 6600GT. But when you turn on the time-shift option (that speeds u thru miles), i gets stuck at times. There are lots of options and you've to play with them to figure out something decent. Overall the game eats a lot of memory - make sure you have at least 1GB ram + enough Video memory. Do write to me what you feel about this.
HAPPY GAMING!!