Yes, a lot play "Dead is Dead" (DiD) which in some games is called the "Hardcore" mode. For example, Karl Myer was a very good sub captain of mine who on his ninth patrol went to scope depth to start his attack run on a Convoy, as he was a "Wolf in the hens house" and the escort came right behind his boat, so he never even had a sonar warning that the boat was coming, and when he heard a loud ping and the blades of the DD coming, He didn't have enough time to scream "ALAAARRRM!" before the DD ran over his Uboat and sunk him with all hands.
I just blinked, said dang, and saluted the men lost and went to figure out the name of the new guy.
My next guy now makes sure to check his blind side when he surfaces, even if there is a Juicy Tanker right in front of him at 1200 meters. When 1943 rolls around, you can barely get out of harbor, on a GOOD day, before planes are bombing you...Thus if Otto Van Graf (my current guy) survives to 1943 (a big IF) he will most likely try to go to Norway and hunt in the North.