The fourth Ore dake Level ga Agaru Sekai novel is… pretty mediocre. The pacing is awful with little connective tissue between events. It also becomes all but certain that it’s going to turn into an inexplicable harem, and those two things combined make it likely I’m not going to continue following the series.
The fifth Moto Saikyou no Kenshi novel is just plain bad. Circuitous dialog, choppy pacing, and overly convenient plot developments are all in plentiful supply. Frankly, I don’t see any reason to keep following this series either.