Alternate Character Interpretation: There are a couple of hints in the series that Lumiya doesn't hate Luke any more, and just views him as a professional rival, so to speak. Other signs indicate that she genuinely does loathe him, and is just good at hiding it from Jacen, who isn't as powerful and skilled as he thinks he is (and Luke himself in Exile).
Critical Backlash: The series is still very polarizing and many of the decisions such as Mara and Pellaeon's deaths are still utterly reviled by the fanbase, as shown by Fanon Discontinuity. However, in the wake of the Sequel Trilogy's handling of similar plot points, many fans have come around to Jacen's fall to the Dark Side and consider it to have been better handled than Kylo Ren's, usually citing a stronger motivation and that at least Darth Caedus was the ultimate Big Bad of the story instead of just being The Heavy the entire time like Kylo Ren was.
Designated Hero: The first five books, in their Alliance vs. Corellia plotline, abandon decades of previous characterization to make previously tight-knit heroes fight each other in a stupid war. Highlights include Wedge, Han, and Leia becoming standard-bearers for the totalitarian Corellian government and Luke and Mara being 100% okay with their son joining the Alliance equivalent of the SS. It's only after they start suffering personal tragedy that they rethink their allegiances, and by that point, they've all been complicit in so much casual corruption that it's only Jacen's outright Sith brutality that makes it justifiable to even remotely call any of them heroic.
Moral Event Horizon: Jacen's transition into a Sith Lord is complete after he kills his Mara Jade Skywalker, his aunt. Despite killing his wife by accident, even Darth Vader never wanted his family dead, nor was he ever willing to kill them.
Padding: The Mandalorian subplot is widely considered this, primarily because it is considered the least important aspect of the series. This is the case even more so in Sacrifice, where the Boba Fett and Mandalorian subplot literally doesn't tie in at all to the ongoing story of the book, let alone that of the series.
Trapped by Mountain Lions: The Boba Fett/Mandalorian subplots in Bloodlines, Sacrifice, and Revelation.
