I'm not going to lie and say that this anime has a solid 9 in any category, but what earns this anime a 9 in my book is how it all works together to make an enjoyable anime.
This anime is not outstanding, but, it has a fantastic premise (Which is NOT SAO, despite what people enjoy referencing this anime too). This anime centers on an intelligent protagonist/antagonist which holds together each character in the first season. This season, after you pass the annoying lizard episodes that no-one cares about, is far better than the first, because we finally see a chemistry between characters that other mediocre anime don't have. Couple that with an interesting premise and a widening world which this season gives us a look at (beginning with Shaltear's incident).