This. I don't interpret self-indulgent as being any different than iddy or idfic, as someone described above. Self-indulgent fic can be well-written or poorly written, just like anything else.

I feel like what people don't recognize is that a story is always going to be emphasizing some themes and elements over others. It's built into the medium. A self-indulgent story is one that emphasizes the things you most enjoy and spends less time on the things you don't. For me, a self-indulgent sex pollen fic would spend most of the time on the emotional aftermath. For lots of other people, a self-indulgent sex pollen fic would just focus on the porn! Neither of those is inherently a bad story.