Yeah Korra was very badly put together as a story. There was no foreshadowing and the spiritual stuff was meaningless. It didn't really further the universe either, which is a pity. Too full of stupid teen drama, and pointless bad guys.
At the moment Shardblade needs rewriting, it just contains all the information that's been contributed so far. Please feel free to write a 'Shardblade' article which makes sense.