Are you disappointed with the poor quality SH5 which you bought? Why?
Who told you to buy SH5? Who told you to buy an unknown product? Ads (trailers, in-game footages) lie, they just want your money.
If something is too expensive or you are uncertain that something has proper quality for you... are you buying this product?
Wait for opinions, for feedback (f.e. on subsim review). No? You bought this game at release date?
So, who is guilty? Developers? Not - it is you, why did you buy an unknown product?
I know people who not bought SH5 because it has DRM. I know people who not bought SH5 because this game is weak arcade or RPG game.
And I did not buy this game - yet. SH5 is really weak, has bad instruction, tragic tutorial, missing a lot of good ideas from SH3 or SH4 (for example: 1939-45 campaign, extensive ADV mode, mission generator). The game is infinite, incomplete, has serious bugs, and the AI is in the early years of very stupid - but this game has something that we missed in previous sections (reaction to enemy activity Uboat, full 3D interior, special orders for crews)... is it really weak? Work done by modders encourages me to buy SH5 - what I see is I'm impressed very nice.
I really regret that UbiSoft has not decided to allocate a one part-time person to work with modders and to review and clean SH5 bugs, but such is the law of the market. Transfer of part of work for modders ("they will fix it") is not a serious treatment of buyers - it weakens the brand team, destroy the publisher opinion.
But the developers work allow create unexpected add-ons to SH4 like "uboat on Atlantic" (OM mod) or "Japanese submarine at WWII" (JyunsenB mod).
I plan to buy this game after the holiday, and convinced me to purchase the wonderful work of modders gathered around SUBSIM community. Their work, however, would not be possible without Dan and his team. At the first time in the submarine simulations games history I could play the Japanese submarine campaign at the Pacific and sink evil Americans, British or Australians, and I firmly believe that for some time I will play type XXI at 1945 in SH5 or play Bismarck, fleeing Allied submarines and their torpedoes.
I want to tell "thank you" to developers for their work - by their work the first mod was already published two days after the SH5 release date.