I want to start by pouring one out for the anime this could have been. It's a shame that production problems plagued this adaptation, because the concept of making the anime black and white and really paying attention to the tone and point of the source material were all good choices. The first episode had so much promise and then we never reached that level of greatness again. That said, the subsequent episodes, while their production values suffered, did an excellent job of taking the story from the manga and improving upon in here and there to make it flow a little better and function well within the constraints of four episodes. Those little tweaks is why this is marked recommended instead of mixed feelings. Yet, I also feel disappointed that we did not get the product we could have had. Maybe someday someone will adapt it into a movie and give it the proper treatment it deserves.
If you enjoy Itou Junji's works in general, you'll likely enjoy this anime. It'd make a great Halloween watch for those who celebrate. If you want something more faithful or haven't enjoyed other Itou adaptations, then this would be one to skip. If you don't like wonky animation, maybe if it gets a home release, the quality will improve.
