This was solidly mid for me, which is a shame.
I think the main reason for this was due to the main character, Persephone. She was just such a manic pixie dream girl I literally could not focus on anything else. The way the characters were drawn was also a little bit off-putting. 

Otherwise, I liked all the characters, though they did seem shallow (though that might be the point). However, I sometimes had trouble telling a few of the characters apart due to similar faces and similar coloring. If I see the next one in my library, I might pick it up since it's super popular, but I wouldn't go out of my way to read it.