As an unqualified and no way smart viewer, this review should be taken with a grain of salt. SAO was the first Anime i watched after taking a hiatus from anime. I Started watching anime again because of this anime. The first Arc (1-13), while rushed, was great and i watch it over and over again from time to time. I really feel invested, in a sense, in the Ship and really do enjoy watching the First Arc. The first time i watched it, i actually cried near the end (no spoilers), which again at the time, was my first anime in about 3 years, so give me a free pass :3. Of course it isn't that sophisticated and missed the opportunity to delve deeper into the more complicated themes and ideas, it wasn't really what i felt the point of the anime, as i own the graphics novels and can somewhat understand why the whole anime was rushed. That said the 2nd arc was not very enjoyable and some might say it was cancer. I felt that the concept of the 2nd Arc was good, but shouldn't have brought another character into the plot, especially when said character gets shipped with Kirito (yes i feel strongly for the axk ship and will defend it to my last breath).
Some might say this is a harem anime but i personally think it isn't but that is my view.
Overall, this anime will always hold a place in my heart, as it brought me into the world of anime again, even if that world does have it's own problems.