This season feels not only samey, but samey in the bad way. Every season/ Story arc should have a different feel in a way the characters should learn something different and different things should happen to place the character in different situations.
Even Part 1 of Naruto understood that, and as a result each story arc felt vastly different from the last.
Korra on the other hand, Season 1...I'm actually not sure what was actually gained, Korra and friends won, but we never actually learned how non-benders felt and that side of the plot ended. Season 2 even shows that Korra didn't learn anything from the first season, no one did. So what was even the point.
Season 2 is like they took the worst parts of season 1, and added a bunch of spirit stuff in it while changing the back drop to the south pole once or twice.
Season 3 was the first season that felt different, the characters were doing different things and were in different situations, it was a breath of fresh air and the ending made you excited for season 4
Season 4, feels like they were hitting story beats that probably should have happened in season 2. While dragging them out or placing thing in a really dumb order. Remember people, we only have 6-7 ep left before this season is done. Yet Korra actually feels further away from her goal than 2 EP ago.