Ugh, I typed a really long reply but it got eaten because of wrong embed. Fuck everything.
Overall I'll cut it extra short and I'll just say I liked what they did with the characters and how they focus on why they are playing the game (because focusing on the whys is always good) but I felt the anime spread itself thin and the plot was felt downright silly.
Oh yeah, the embed. I was actually disappointed by the OST considering it's Kajiura Yuki. Reminded me why you should never use vocals in songs you plan to reuse. There were some good things (embed related) but overall I didn't like it.
Overall it reminded me a lot of Noir, it's like they are twins really. Both made by Bee Train, both directed by Mashimo Kouichi, both OST by Kajiura Yuki. Same artstyle, same amtposhere, similar soundtrack. I didn't like either, heh.
Did I mention Mimiru was deliciously brown?