'Manhole' is a good police/crime mystery with some awesomely disturbing imagery. The story is creative and unique, and even though it isn't exciting 100% of the time it has a nice payoff at the end. The characters are rather bland, but not bad either.
The quality of the art varies a lot. It is awesome when showing the victims in great detail, and the character designs are okay for the most part. It is lacking however in many backgrounds, and there are no interesting perspectives or anything during the dialogue-heavy parts.
If you want to read a dark crime story with lots of "disgusting" images
and an interesting story, go ahead! Manhole isn't a masterpiece by any means, but it is entertaining nonetheless.