I'm a little bit late to the party here, but please ignore everything you've heard up until this point, all these children except for Gnashes have not been enlightened with the true meaning of a good anime. I will bestow upon you the best animes I have ever gazed upon. If you are looking for animes of the same caliper of SAO, there are far and few between. However, personally, I recommend Akame ga Kill, Parasyte, or Mirai Nikki (Future Diary) if you are interested in more action based animes. If you are looking for the more slice of life/school genre, I wholeheartedly recommend Clannad, Oreimo, or The Irregular At Magic High School. All great shows!
Edit: After reading this through and receiving a personal message requesting my opinion I feel like I must express my feelings of SAO. Personally, I loved the whole series and anyone who says any arc or portion of the story line is shit or simply okay should neck themselves.