1>4>2=3. Season 2 would be my favorite, but they really messed up that ending. Season 3 was alright, but it felt like there weren’t any internal struggles for most of the characters, and Harmonic Convergence is dumb. Loved the Lynn plot, though, and the fight scenes were cool. Season 4 was amazing. I love literally every second of it. Admittedly we didn’t get enough Wheelchair Korra (Wheelchair Korra is best Korra), and the timeskip was a little jarring, but I loved all of it. Yes, even the giant mech. Season 1, though, was definitely the best for me. The Benders vs Nonbenders inequality was a neat take, and while I do wish they had delved deeper into the issue, it gave some good moral standing to Amon, which worked great for his contrast wity Tarloq. Admittedly, the revolution falling apart once Amon’s secret came out wasn’t the best ending, but meh, I can look past that for the rest of the phenomenal writing. Amon also feels like the natural next step for an Avatar villain. Also I love Amon. Everything about him.

Hey, it's nothing that some rope, a weird monkey statue, a hot air balloon, a well-trained platypus bear, a bunch of barrels of blasting jelly, and a whole lot of ingenuity can't solve