Ignoring the parameter of anime, even in American television shows these days, it seems like everything is over-dramatized and so many inconsequential scenarios are built up to be a big deal. In K-On, nothing is a big deal - it's seriously just a half-hour spot of relaxing, fun enjoyment. This is the charm of K-On for me.
If you're looking for excitement on a Gurren-Laggan-esque plane, K-On is not going to give it to you. If you're looking for a panty-shot every other frame and an outlet to swoon over scantily clad girls, then K-On isn't going to give it to you (despite the entire cast being female, all of whom are absolutely adorable).
K-On is by no means a jaw-dropper, but there is a certain calm aesthetic about that I've never really seen in a show before. It feels good to watch a group of best friends getting along and playing music (or more often, eating pastries and drinking tea), so if you're looking for an easy-to-watch show with no hidden, analyzable motifs that simply exists to put a smile on your face, I couldn't recommend anything more highly than K-On.
