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Kudzu Plot comes to mind
"Complicated, incomprehensible plot" is Kudzu Plot; otherwise, try other plotting and characterization tropes in Bad Writing Index (not necessarily YMMV, but don't let fan opinion bleed out so much in the non-YMMV entries).
Edited by Synchronicity
The Chris Carter Effect is the YMMV for when Kudzu Plot crosses over from Lost-type "it's insanely complicated but it really does make sense if you take detailed notes, rewatch certain episodes a few times, and check out the wiki for analysis of each episode" into "Okay, the notes do nothing." Again, mind the difference between Complaining and objectively noting things which bother some viewers.
Edited by Scorpion451
Beatless has been going on for a season now, and ... out of all the anime I have watched, this is the only one where I don't understand the plot. The motives of the many actors. Reading in forums, it seems I am not alone. Naturally I must express my righteous indignation online so that others may learn from my wisdom. What trope is this and what tab should I put it under? I'm guessing YMMV.
Edited by Orbitron