I'm going to get lynched for this, but I do not wish to lie so I'll be clear about it.
K-On! - As a SoL anime, it was okay, and fairly entertaining. I managed to finish it, but what follows after is a different matter. The second season was just difficult to watch. I picked it up since I was expecting some decent music, but it was disappointing too in that regard. It seems cute girls doing cute things most of the time doesn't keep me entertain that long...