This author continues to replace a real story with sadism, psychopathy, extreme violence, carnage and lack of total human decency. If you consider that this web novel series and light novel series was created for minors (underage readers), then it worsens. What values (ethical, traditional, cultural) could a story like this have? Is it entertaining to have extreme violence and carnage as theme in a fantasy-isekai-like-this-one? Was the main theme of revenge weak, if the main character did not have any abilities the moment he and his class was isekai-ed to this alternate reality world? The Goddess was cruel, and just one of the students stood up for him, but without any martial arts training, without any real abilities, and the biggest resentful wimp of the classes?? What can this wimp of a main character do?
If you add the fact that the story is a copy-cat/plagiarism of Arifureta: From Common place to World's Strongest, Is it Wrong to pick up girls in a dungeon and That time I got Reincarnated as a Slime...the plot arcs in this one are weak, the main characters aren't developed well, there are no maps, no character summaries, and even the illustrations, those of Ais Wallestein are carbon copied/plagiarized into Seras (the elf) while the original was illustrated in 2012, this one started publication in 2019. Same with Arifureta, written in 2014, and this story came later (5 years) and they both have the same publisher??? Why would a publisher plagiarize the author/illustrator of other works under their management??
Main character helps as much as he can, but being a teenager student with no real martial arts training, no real strategic/military/tactical knowledge makes all of the stories somewhat flat and revenge-resentful-centered which gets old in the second, third, fourth book, by this eighth book it's nonsensical, irrational, illogical. Sometimes the best revenge is to let things go, to forget them and to just leave. Especially in this case, where the Goddess was looking to exploit everyone that was isekai-ed to this other world. The less time the main character spent serving the Goddess, the better it could be for him. By being exiled to the deadliest dungeon in this other world, the Goddess actually made the main character strong, resilient and focused (characteristics/traits that he did not have before).