@lphj majority of the hate are from mindless NPC who review bomb any doujins who reference the croc even though this format is just a simple one page manga though the difference is the author has a page limit.
They are NPCs because they barely check the content but just look the title and then rate this 1. The only version of this they have not review bombed in the one with Kazuma x megumin where they will get married in 100 days cause again their NPC Based on their codes anything konsuba they will like even if its in the 100 days format which is just a one page manga with a 100 page limit heck Japan love this and they ain’t complaining but here we have NPC in mangadex so it’s pretty sad.
This would probably be around 7.0 with 7.5 max higher depending on the ending if the NPC did not review bomb this manga.
Edit: looking at the actual scores there are actually a lot of 10 so people are eating this up just like daughter x mom but again the review bombing is messing with the scores