This anime, is very mediocre, it starts well, in the case of some people who are trapped in a virtual reality video game which connects through a helmet to the nervous system, so far so good, until something new, but it begins to decline from the chapter 8-10 where instead of continuing on the path of action (Having before, small gestures "loving", but not remarkable), it becomes a typical love novel, and with the typical cheesiness.
Overcoming all limits, from the ridiculous in chapter 14-15, where the game is changed from SAO to one called ALO, where the characters are elves and fairies, in addition to
having to go and rescue the "princess" (typical fairy tale literally ), at the end of the day if you scored from chapter 1 to 14, my score would be a 6.5, but as we are talking about, the entire anime would give it a 3 and say it is quite a lot.
This series could have been epic. With the foundation that has to develop in the right way. First, he should have addressed issues such as denial, rejection, despair, and the characters' madness after the news that they are prisoners of the game and that they can die at any time, then they should have been presented in more detail as some of them. decided to move forward to live, and as others will be left behind for fear of dying, as little by little the deaths, the time spent in the game, affect the characters (this is shown, but superficially, I repeat) as people begin to committing suicide, going crazy, like people who begin to have power abuses the weak, like those who fight at the front have reasons, personality and willpower to risk dying to save others, (with more personality than Kirito ), as the leaders of the guilds will begin to see their subordinates as chess pieces, losing their heads, sacrificing people to win the bosses, as there would be people who will accept and resign themselves to living in This world, like other people preferring to live in this world, will try to avoid at all costs that other people end this virtual world by killing to avoid it, and finally, that the most animalistic instincts of people will be shown, the survival instinct, cruelty in the face of despair, getting to do anything to save his skin, and finally that the love between the characters (which seems to be the main thread of the series) could also appear for all the emotions experienced and risk day by day life, that the bad man will leave you breathless with his complex of God ... etc.
All this presented in a slower and deeper way than what is shown, in walking dead plan.
I don't know, it's just my opinion, but the series could be tremendously epic, from 10, however, it reaches 4 being very generous. (And even more now, with the world of elves, who can believe that after living and going through such an experience, "two days" later, Kirito will get back into the game of his own accord. Besides, these games would be more than prohibited after experience with the first!)
In conclusion: I would say that it is an anime that I would not recommend, since it treats people as if they were ignorant, and idiotic, to those who want to see it anyway, I would recommend that they watch it, until chapter 14, since after hence, it's not worth it, believe me.
(For the only reason I finished watching this anime, it was to give my opinion more solidly, since I am of the idea, that you cannot criticize something if it is not known)
Even so it is a pity, that an idea, as good as this, ends in something as bad, decadent, and mediocre as it was, the idea was not bad, I would not even say that the design of the landscapes, nor character, not even The main argument, if not the bad way to develop this was the problem.