Bad being subjective, let me follow up with the objective good. It has a proper ending. If you were into the show, and cared, it resolves the main plot issue of the anime. The others that it hasn't really touched upon yest are left open for further development. Unfortunately I seriously didn't care so YMMV.
The series big problems ?
It's a comedy that didn't make me laugh, NOT ONCE!!!!! . It did manage to put me to sleep so it may have some value there. There were opportunities but they weren't well used. I did watch it dubbed so maybe the humor was thee in the original Japanese and didn't make it over.
It's a romance ? Nah not really. I certainly didn't feel it. Maybe it was the whole setup of having the main character forced into the situation, maybe it was the fact the attempt of a mystery element overshadowed any possibility romance. Or maybe, it was just the fact that what passes for romance is, really weak.
Mystery ? I went with my first instinct and was right. Kind of killed it, but even if that wasn't the case it still wouldn't of been a good mystery. To make a mystery work, you need the riddle, you need clues, and you need motivations for the actions that make sense, and you need tension. There was no tension here. Can't say more without giving away too much of the structure. There was no real motivation for most of the key actions that were meant to contribute to the mystery. If the killer isn't a psychopath they need a reason to kill. Here you just kind of scratch your head. The clues are just annoying. You get clues, that are important, accurate and then invalidated for silly reasons.
The story fails on multiple levels. The hook is novel and interesting. It has an incredible amount of potential but there's just too much you have to overlook. No spoiler here, but at the beginning you are told, the father had been dying for 6 months and it's clear he wasn't comatose, yet the takes no time to convey information needed to his children, or provide for them, undercuts the premise. After that it goes down hill on trying to draw you in. As mentioned up top, the arc resolves, so there's at least that.
Characters. Shougo is interesting. He has his motivations, mostly acts believably in dealing with the insanity. Some of his reactions are off even taking into account the restrictions of the genre but that's hardly unreasonable. The other characters take 2D women to a new level.
The art is OK. Faces are distinct and expressive, emotions well conveyed. Backgrounds could be better. The artwork was meant to be a supporting feature not the star and it does its job.
The sound, oh the sound. The music was nothing special, but the voice acting was annoying. Most of the female characters sounded either weird, flat, or annoying, occasionally all three at the same time.
