> He’s no stranger to mysterious and complicated plots—planned from the very beginning, and designed from the ground up, to keep viewers guessing.
If anything this is the main problem I have with Abrams: his 'mysterious and complicated plots' become a lot less fun once you realize that their only goal is to keep you guessing without much of a pay-off.
This doesn't have to be a problem, provided that the plot offers enough in itself. But when a substantial part of the plot revolves around the mystery, there better be a reward!
I've been enjoying The Leftovers, which was created by the other dude who worked on Lost. At this point, nearing the end of the show, I could still live with never having an answer to the central mystery. But this is primarily because 1) the showrunner repeatedly said that it's not about the mystery, and 2) even though the show is walking a fine line, the mystery is still secondary to the individual characters' journeys.
The first (and perhaps second?) season of Lost are still among my favorite seasons of any show ever. But I feel they're tarnished by the convoluted, mystery-in-a-box, answers-that-lead-to-more-questions, ever-more-ridiculous later seasons, and a finale that we were explicitly told wouldn't be the case way back in the first season!