There is one thing I love in animation, and hell, production in general. When people are shown playing instruments, they hit the actual notes, strike the right drums/cymbals. K-ON!, as a show centered around a music club, nails this. It is a visual pleasure to watch these girls play, simply because it is right. It is correct. It is well done!
The characters themselves also look nice. In a world of little ragamuffin schoolgirls infiltrating every anime, height is welcomed! Are they still trite personality wise? Hell yes they are. They're the same 5 girls we see in every show, just with a slight name change. Ugh, but again, the art is better than usual. Yay points!
And then they talk. Yay horribly contrived lines delivered via chipmunks! Whoooo! So kawaii