even SH3-stock (I played more than a year without any mods - right after its release) is a very immersive and accurate simulation.
only after I installed it again and encountered the "save-game bug" I came here to SubSim and learned how to add even more realism and immersion to the game.
graphics I never considered "ugly" or out-dated, because I prefer the strategical and tactical aspects of the game.
regarding immersion: some convoy-attacks (especially after mid-1943) were so "frightening" (because of the bright and ever-alert escorts) that I had to pause, smoke a cigarette and cool down my nerves to continue playing.
regarding replayability: especially like to open and dynamic campaigning. no patrol is like the former one. you can do whatever you like to achieve your goals, after visiting your patrol-grid you are free to sail whatever hunting ground you estimate to be juicy. e.g., in Operation Drumbeat I travelled to the assigned PG but guessed there might be better grounds with more depth under keel. so I hung out around the SE of Halifax to hit poorly defended gathering convoys there.
as for comparison with SH5:
first I must say that my only impressions are from the SH5-board and some trailer-vids.
I think I'm not wrong when I claim that the majority of the members of SubSim would have been content with a polished and graphically enhanced version of SH3. but SH5 turned out to be completely different.
I really am disappointed how the publisher treated this sequel to the series. not only they established the most rigid copy-protection which has you to allow UBI free access to your PC-data, they also force you to set up a personal account at U-play, which I never will do (just want to play a game, after all). the only "relation" I like to have with UBI is that of a provider-costumer one, nothing more.
also there are some issues in game-play that will bring me to - probably - never buy it (even if DRM is patched out):
- no compass
- no depth under keel
- RPG-elements
- broken AI
- patrols end after achieving the mission-target, even if you are amidst an attack (you will be teleported out of the game)
- and many minor bugs (amongst others the old save-game bug)
sure some of them might be fixed by patches or the modders but I doubt that I ever can make friends with SH5 (pls think about the 3/4 of players who don't know about modding or do searches in the netz about them!, they have to deal what UBI presents them!!).
finally, pls be aware that some more SH5-postings will occur here in the board of SH3. mainly because of provoking and showing how "superior" SH5 is, some others would like us to change the "sides" of our beloved sim. we might have to cope with being adressed as "boring old-farts" because we haven't changed to SH5.
but I can live with that
edit: but I do look forward to SH4 with the UBM add-on (Ducimus pictured it in shiny colours, so I surely will give it a try)