Initially, I was interested in the series due to having the same writer as the Zero Escape series and in that I was not disappointed. The game is funny and largely light-hearted, despite being centered around brutal murders and a serial killer on the loose. The story has good twists and turns with some being more surprising, but more obvious when you look back with foresight.
On the topic of the story, I think it has a good balance of keeping the comedy and serious aspects appropriate. This may not be the case for everyone, but for myself, I was never bothered when the transition happened.
Gameplay can occasionally get too silly or perverted which distracts from what your goal is, but the options during the Somniel portions are always entertaining, even when you screw up.
All in all, this game is good for those who enjoy murder mysteries and do not mind silly anime nonsense. It separates it, both positively and negatively, the degree in which is subject to the viewer.