First of all my opinion is biased because I played the Novel before I watched the animation.
Story: Rushed rushed rushed and rushed. I don't know what they were thinking when they squeezed a 30+ hour plot in a ~6 hour animation. Many details are completely gone and some important plot elements were reduced to a minimum. I don't want to spoil so I keep this section rather short.
Art: Oh my god, droopy the animation. The art is horrible in every possible way. One word for this -> QUALITY
Sound: Can't complain here but I do like the original OST more.
Character: Side character development comes rather
short due to -> squeezing the plot.
Enjoyment: As you can obviously see I don't enjoy this anime very much and to put it bluntly I'm biased. I'm just watching this to see which ending they're going for but I can probably guess.
Overall: For me it is a 4~5. For the average guy who didn't read the Novel it ould be 7~8 probably.