The art is what makes this series outstanding. A lot of artists can draw manga but no artist can draw the subtle expressions so perfectly the way this artist does it (except maybe Grand Blue). Every chapter, lit my computer on fire because the romance was too spicy.
If she/he wanted to she could ship the main character with a rock and have you on board in 2 panels. It's is that good. I read from chapter 29 where the anime leaves off. People who don't rate the art highly probably just didn't notice or haven't read the more recent chapters where the art really shines.