A recurring trend I’m seeing in this thread is that those who have studied grammar seem to have a huge advantage over those who haven’t, even if their WK levels are widely spaced. On that note, recently I picked up book 1 of Doraemon (ドラえもん) and was absolutely amazed at how much of it I could understand right off the bat. Probably around 75% comprehension, which is honestly enough for me to keep reading and looking up words from time to time.
That said, I also finished Genki 1 and a Memrise deck with all the vocab from it, so ymmv.
