First, I'll try my best not to include spoilers but be aware that I might accidentally add. By the way, if you find some grammar errors, please ignore and just bear with it because English is not my first language and I'm not good at it.
I would say that this was pretty mainstream. But sometimes I think it's overboard. You could say the story was interesting being trapped in game and when you die you'll die for real. You could also say this was kind of similar to .hack(I just read the synopsis and some recommendation and I think they were.) But the adaptation fails a bit. I mean it feels rushed and they just add side stories so I felt the development was not nice.
Even thought the adaptation of the story was not so good that I was expecting, the art and animation was outstanding(So I rated it 10). I mean, look at those visual effects. And the sounds was good, the OP and ED was good(both 1 and 2). I don't have complaints on the seiyuu since they're doing a good job. Character, the development in anime for the character was not that good for me. I feel like that Kirito and Asuna needs more attention on the past episodes. I mean seeing them both because I feel like Asuna just like Kirito pretty fast(Maybe just for me.)
But, ever since the ALo Arc, I enjoy it more than the first because the first was a bit fast but I think I know now why. I enjoy the series and I feel the anger for Sugou. I think the emotion of the viewers was part of the enjoyment(for me, at least)
Overall 8.
I think you can enjoy this anime too. But some of just think that this was overhyped anime but I don't know because I enjoy this kind of stuff. But this review was just my personal opinion and thoughts about this anime. I maybe biased in some points.