I watched it this summer holiday and I loved it. It's one of my favourites.
I was impressed by many things. First of all, those living zombies or whatever they were. Before watching the anime, I read a few things about it and I was absolutely sure it was going to be more realistic. Second, the plot twists were just amazing and unexpected. I was able to predict only the fact that Maximilien was a good guy
The ending seemed very fitting to me, it wasn't too sudden like in other series.