Jump in. The waters lovely here in the Pacific
Seriously, Most, if not all the, major bugs have gone. The attack map (which you were refering to) now works perfectly.
In addition to a nice and stable game engine you now have access to almost a years worth of mods to play around with.
By no stretch of the imagination am I a 'submarine geek' (meant in the nicest possible way) but I haven't fired up another game for about three months and have probably played ShIV fo about 9 months out of the 12 it's been out.
Maybe I am a submarine geek after all.
Good hunting