newb questions

hi im new, especially to SH5. Can I get some help?

First of all is magnus opus worth it? Are all the good mods covered there? like this or something similar http://www.subsim.com/radioroom/showthread.php?t=163930 How about the IRAI mod?

Second, are there any bug-fix community patches around?

Third, I just come from SH3 GWX 3.. I was drawn here by the graphics. I tried playing this game vanilla p. 1.2 but
a) the hydrophone was seemingly useless.
b) why doesn't the game stop when a ship, especially an enemy one, comes in range like on SH3?

hehe This is not a joke: once I heard an explosion and slowed down from 1024x speed and found myself ramming a British cruiser which was shooting at me!