Problem is that it was the ultimate self-insert for teenage boys. Kind of like Twilight for teens. Kirito was a flawless, no-depth character with every single girl falling for him, drama was bad, the show began with about 7 friggin' side-stories and no progress on the actual dungeon-crawling stuff (70 out of the 75 floors were off-screen or so), no actual character development... and yeah it was bad.
The fight scenes we good, though. Too bad there were about 4 of them in the whole anime.