People have definitely been too hard on this series. The art is bad? Only so in the beginning. The hardly imaginable plotlines? Come on, this is manga we're talking about. The medium that produced Majin Tantei Nougami Neuro - one of the most over-the-top, unrealistic and delicious detective series ever. Fer chrissake. The fanservice? If you're grumbling about that in manga, you're probably left with Worst and Gon.
The art is decent: simplistic, true, but it conveys the moods and character expressions nicely. It reminds a bit of Baka & Gogh, and is certainly better than The Hating Girl (which is a nice series, despite the abysmal drawings). The plotlines hold their own well against the genre standards. The story writer does run through the crime fiction cliches, but the whole genre is based on cliches anyway, and what matters is that the intrigue is present and the perpetrators aren't obvious enough to be guessed beforehand, at least during a casual read (you aren't going to meditate on this series, are you?).
Besides, there's a little ace in the sleeve here: the characters' behaviour is surprisingly realistic, especially in case of the heroine. The story is built around and propelled by typical plot devices, but the heroes react to the environment like real persons, not like stock characters of shounen mangas, whose actions are like a true hobbit's opinion: you needen't bother to check it out to know it. No profound psychological depth, but it's a nice selling point for those who like to read about people, not cardboard cutouts.
All in all, this is a typical manga, of course; nothing groundbreaking. But if you don't go in expecting Urasawa Naoki, you may be in for a nice little surprise. I know I was.