I would have to agree with RR. The game can be as realistic as YOU make it. Ducimus' TMO, for me, helps along those lines. I play at 100% realism. No external views etc. I find the game bloody frustrating at times but in a twisted way it makes it more enjoyable, LOL. Maybe it's just the masochist in me, LOL.
If I miss a target, I try to figure out what went wrong. With no external view, this is a challenge in itself. I normally fire at least 3 torps at a given target with a fourth on standby ready to adjust if I miss and am able to determine the cause from the periscope.
I find TMO to add the right amount of challenge given the way
I play it.