Looking at the reviews I find them briefly unfair. Of course you have the right to share your opinion, but be a little bit more subtle unless you have experienced using effort into drawing and planning a manga. Although maybe that's just my concept of fair criticism. Now to the manga, it has a simplistic plot making it a good guilty pleasure. Sometimes simplicity is key in stories and in addition the artist has a consistent artstyle and a great grasp of fundamentals in the positions and facial expressions department. The artist also uses a pleasant alternate chibi like style which flows very well with the main artstyle
this is simply my opinions and your 100 percent entitled to your own opinion!