In my opinion, three things would add immensely to the immersion factor: 1. decent communications with HQ and other boats (also meaning missions like in SH4); 2. wolfpacks are a must, also implying a competent sub AI; 3. realistic behavior of hunted ships, i.e. speeding up, changing course, trying to ram the uboat, like in real life.
However, the devs have their hands full getting SH4 anywhere near decent gameplay and will surely have no resource left (approved by UBI HQ) to patch a game 2 years old, which nears the end of its buying potential. Unfortunately, a new patch is only wishful thinking for us, I think.
