-OPTIMISED CODE! SH4 went part way there
-Accurate AI
-SH3 Commander (incl Crew Manager and Patrol Log Editor) functionality built in, especially date based changes. SH4 went part way there. I think it is fair to say that if it's in SH3Cmdr, it's because there was a community demand for it. Adding a Nightclub feature (for example) is a simple few hours work but makes a big difference
-Ease of modding, including ability to add new subs and nationalities (ie British, Dutch, Japanese)
-Improved crew management - I have a Chief Warrant Officer, let him do his job of micromanaging crew rotations, discipline, admin paperwork (transfers) etc
-Accurate ranks, including JNCOs
-Medals/badges awarded as per historical criteria and timelines
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