If you enjoyed avatar the last airbender then you will enjoy Korra. Yes it has more of an adult vibe to it, but everything set up in the airbender universe is still here. Great story, history, action, and drama. The show always kept me wanting to watch the next episode. After recently finishing airbender series, I was down that it was over. But Korra immersed me back into the awesome world of the avatar for a new experience.
Blu ray had a cheap price, looks stunning. Extras are lacking, but honestly didn't bother me.