I don't always have to like the characters in a story in order to enjoy the story, but as a general rule, if I want to punch them all in the face for the way they're behaving, the odds of me enjoying the story are pretty low. (I blame a scarring experience with Death of a Salesman in high school. You know that scene from Clue, where Mrs. White goes into her whole "flames on the side of my face" bit? Yeah. Like that.) Basically, I need a reason to care what happens to the characters, and liking them is the commonest and most comfortable path that can take; if that fails, then I need curiosity, or a desire to see them get their comeuppance, or (sometimes) a non-character reason like a fascination with the world.
Good answer, I agree with this. Characters don't have to be likable, but if I care enough about them then I will keep listening to find out their fate.
I'm afraid I just may not be a fan of Swirsky's work. Maybe I'm partially saying that because the long Swirsky Podcastle story that ran the same week left me equally cold. I gave it a listen for 15 minutes or so, but I just got sick of the moping moping moping and didn't want to listen to moping for the rest of the episode. I realize that people in real life too, but it's just not interesting to watch at length. In general I'm just not that big of a fan of novellas because almost everyone I read is at least 4 times as long as it needs to be, and this dilution of the great ideas makes it less interesting for me. This is true for me with novellas in general, but this one was compounded by all the moping.
It was a good ten minutes in before I realized Lucien was artificial--that was too long for that to go ambiguous, though I seem to be the only one who had that problem so I may have just missed some important clues.
And there were some parts in the part that I listened to that induced groans from the choice of wording. "Excruciatingly pale", as I mentioned earlier, is one of these. That particular phrase could work in a comedic setting because it's just plain silly, but in a story that's trying to take itself seriously it just doesn't work for me.