Ok, hear me out.
I'm giving this a 10 because of all the potential.It was the first manga that where i thought "Hey this manga could be great if the author had more time and budget to write the story".The start was amazing and not a cliche like other manga/anime, so thats a bonus.The art was goergous i really enjoyed it.
Now the problems come from the plot and character development.
Since the manga ended prematurely there was really no good character development or plot depth and the ending was REALLY rushed.
Now like i said, i gave 10 because of it's potential. If this manga was given another chance, i think that it would really deserve a 10.