I have abandoned because I never got that Golden Ending. I played through all the other ones and knew how to get it but I just stopped.
Maybe the updated release gives some of the endings more oomph but in the original they're all comically bad. The nature of the mystery and even the genre changes depending on which ending you get but it only affects the last chapter of 10 in every run. So there's big tone changes whenever you get to the final chapter and most of the endings aren't properly built up to and just fizzle out.
The best ending you can get on a first run is hilariously anti-climatic. It basically amounts to "There wasn't a mystery. She kind of just didn't want to talk to you that much and everyone is very stubborn about not telling you."