I can understand why this manga has received so many low scores: from a reading entertainment perspective, Tsumi to Batsu is a dark, convoluted, inconceivable and abstract work of art that only caters to a niche range of readers.
However, from a literary perspective, this manga is a goldmine. Though not up to the level of Oyasumi Punpun, Tsumi to Batsu is nonetheless a masterpiece that follows true to the original theme of Dostoyvsky's novel, Crime and Punishment.
Using the same foundation of the novel but in a wholly different setting, Ochiai Naoyuki does an excellent job recreating the chain of events that transpire as well as providing the readers an omniscient glimpse into the psyche of the main individuals.
With that said, if you're looking for a quick and easy read, look elsewhere; this is something deeper and more profound that's meant to be shocking and thought provoking, portraying a realistic view of the depravity of society. Definitely not something for the faint of heart.
However, works of this caliber are definitely exemplary material for comparison essays or term papers.