After planning on watching this show for years, I can finally say that I've seen it from start to end. Whew.
STORY: 7/10
I was going to give STORY an 8, but the fact that everyone over-hyped this as the "best show ever" and told me repeatedly that I had to see it, I couldn't help but feel a bit let down by some of the directions the story took. I was always expecting to be more surprised, or taken by some sudden twist, but except for a couple highlights the show's storyline was quite predictable (especially towards the end.)
ART: 6/10
I didn't notice anything too special with the artstyle or the animation, but there were a couple things here and there that are unique to this series, which I really liked.
SOUND: 5/10
Nothing about the soundtrack really stood out to me, and I actually disliked both of the openings and endings. The only music I liked is the one they play at the end of 37.
CHARACTER: 9/10
With the exception of a few of the characters they introduced later on, they did a great job with creating interesting characters that were fun to root for/against.
ENJOYMENT: 10/10
"Pure entertainment" is probably how I would describe this show. It's not as crazy good as everyone makes it out to be, but I actually found myself looking forward to watching the next episode tomorrow when I went to bed. Only a few shows have actually gotten me hooked like that.
OVERALL: 6/10
As stated above: over-hyped. It's a very entertaining show, but the fact that it was over-hyped made me expect more... which I didn't get. And I disagree with some of the directions the story took towards the end... it almost felt like the author didn't know how to end it, and just adding in a bunch of new characters... it felt very odd considering all the good things I've heard about this show.
Still, I'm giving it a 6/10 so it's definitely not trash. It was a really good, enjoyable anime, and I'm glad I watched it. But at this point in time I would say I probably enjoyed Ajin or Steins;Gate more.