As stated, Hi-Tech has wanted to get U-boats for some time. They may or may not be in the works, but his father (I believe) was a submariner, and he has a passion for this area, so chances are, you'll get your sub sooner or later.
The strat debate rages on. Read a few of the more current threads and you'll see what I mean. There is the usual camps here, 1 for all out Quake Style gaming, and others for a more cerebral Strat WWII Sim.
The mission arena will be out sometime soon, which may make the game more for the WWII Sim minder folks. Otherwise, I highly recommend signing up for Tour of Duty (1 life, set mission, etc)
If you are interested, I would also recommend joining a squad, ot at least participating in Missions. The Marine Air Wing is always recruiting, and I'd be happy to give you the tour.
As for childish behavior....2 recommendations...
When you log in, type .squelch 1
This will squelch the constant barrage of BS you see in the gray text.
If someone is particularly annoying, simply type .squelch (Callsign of annoying person).
And if you really want to avoid anti-social behavior, don't read this board!:D
Welcome, and good luck.