Personally, the graphics of both SH3 and SH4 blew me away. For all I care, I would take either game's engine with minimal improvements for SH5. I would be more interested to see better AI, less bugs on release, wolfpacks, better crew management and sub upgrade interface etc.
I don't consider graphics to be the problem in the series, it's the bugs and that feeling of being alone while on patrol. The radio messages in SH4 didn't really cut it.
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