I agree about how the FPS'ers "upgrade the map and some graphics and release" It's really lazy and thoughtless when you think about it, but then again people buy it. I'm content with my SH3 GWX3 and SH4 RFB. I really don't know if it can get any better than that to be honest. The only way to be the most realistic would be to join the Navy and get on a real submarine. I however don't think real sub life would be as enjoyable as playing a video game....
That being said, I really hope Ubi doesn't come out with a SH6. Enough already, what else can be done?