As many people have said, SAO squandered a lot of great potential. The premise of the story was interesting, but as the show wore on, it just... killed it.
Kirito is probably the worst character I've ever seen. He's a Gary Stu if I've ever seen one: Actually Perfect, super powerful, all the girls fall in love with him. And there is so much annoying man pain.
Asuna's character actually isn't bad, ...