There are no good or bad endings in pb1. There is one end of game state, that has the couple still being a couple and thus a tie in to a sequel. The other "endings" have them split and the results of a few months later shown.
As for decisions in pb1, there are actually none. It is illusion of choice.
Art was fine and story captivating enough, but I stopped caring after being railroaded too much. Escpecially the blackmailing stuff. It is not a choice, if you are presented with "do the thing" and "do the thing but be angry". And your only reward for not going along with the railroading is, that you will be locked out of chosing any further juicy actions, because that corruption mechanic is terribly implemented.