Let me just start off with this K-on is a Moe anime aka cute girls doing cute things if you do not like Moe Anime then you will not like K-on.
Story 8/10: Despite what you may have seen or heard music is not the main focus of K-on!! while they do perform they don't do it enough for this to be classified as band anime. K-on is much more focused on what the girls get up to in daily lives. But there is theme of time in K-on!! which hits you every so often that lets you know times is running out (because they are seniors) until it hits the girls as well. I'm not for crying about anime but during this I cried. This to me sets k-on!! apart from all other Moe anime.
Although the last few episodes felt out of place.
Art 8\10: Nothing out of the ordinary really sometimes the animation can look pretty impressive tho. Fits the anime well.
Sound 9\10: Even tho there are few songs they are all great From Fuwa Fuwa Time to U and I every song is a blast to listen to. Also both the ops and eds are great. The backgrounds are pretty good too I find my humming them sometimes Overall a pretty memorable ost.
Characters 10\10: While some are minor a lot of character development does occur in K-on!! All of the characters they are in the light music club but we do see development in other characters such as Nodoka or Ui. ( Can't say the light music club develop because of spoilers)
Enjoyment 10\10: Must of K-on!!'s Enjoyment comes comedy which I can safety say for the most part is funny. Basically you have Mio and Azusa who play the straight man.
Overall 10/10: K-on!! isn't just a another Moe anime its a coming of age story with hilarious comedy and a loveable cast of Characters. K-on!! season 2 Is a MUST WATCH.
