Uh, there is absolutely nothing wrong with Dark Urge though.
Its still a 100% custom character, just a slightly different story, and a bit more content.
Literally the only thing you really lose is the choice of background, and the whole idea of D&D5 Backgrounds is not something I'm much a fan of in the first place. Even worse in D&D5.5 where they doubled down on an already bad idea.
Haunted One isnt a great background, but its also not the worst, its inspiration events are easily enough to do.
And as a Dark Urge you get some pretty good items you wont get otherwise.
Quite frankly there is no good reason NOT to play a Dark Urge.
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About being close to the original rules, well thats always the same discussion for every D&D game. Larian has a lot more homebrew than any other D&D computer game, but its fun on its own right. Rather than embarking on the endless quest of trying to "fix" it, I think I'll enjoy it for what it is.
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Yeah there is absolutely no point to the Origin starts. I can only see disadvantages from them. You cant design your own character, you are stuck in a combination of race and class you dont want, its just bad.