I see lot's of people haven't updated their views on SH4 very recently, so here's an extremely quick refresher on what has happened during the last two years. I'm naturally talking about a modded game here.
- U-boats are now featured, with most of the models playable and a world-wide campaign. An "AOB Finder" similar to that of OLC is also featured. U-boat expansion from Ubi brought us the framework and modders did the rest. Those who wan't their asses majorly kicked can do so again
- Plenty of playable surface ships have appeared, something which I haven't touched much so I can't comment more on it. Nuke subs go to the same category.
- The game has been patched to a somewhat working status, and then abandonded. Bug-wise I'd say it's in a slightly better shape than SH3.
- The "supermods", and mods in general, have matured a lot.
- It's definitely not easy anymore.