I recently finished watching the K-ON series (even including the ura-on specials).
It was alright. To my surprise, the most enjoyable aspect was the comedy. This is unusual for me. A lot of the gags were frequently quite funny.
Azusa was my favourite character and I honestly feel like she was the writer's intended 'actual' main character, as opposed to Yui. god I wish I had long pretty twintails hair like Azusa. God I wish I was Azusa
Production quality was solid, as one would expect. Although I can't stand the colour palette. I don't really like any form of rock (so I'm biased in this respect) but some of the songs (ie. character songs) were nice and I actually put a few on my music playing device.
Okay, having stated the above, I found the series mediocre overall. I try to ignore expectations going into anything, but despite that I couldn't help but feel mildly disappointed. K-ON was not the timeless classic I had been lead to expect. It wasn't any better than your average seasonal SOL. I am bewildered by how it has received so much praise.
For a series as long as K-ON it's amazing how little character development actually took place. Every character felt so bland and lacked any depth and nuance. This is fatal to any SOL, especially with a long episode count. Overall direction was also unremarkable and unworthy of any praise.
Consistent 6/10 and totally forgettable. It was comfy I guess.
basically you have shit taste if you really liked K-ON and should watch more SOL