I thought Korra was entertaining, but it lacked a lot of the internal consistency that ATLA had, in favor of superficial explorations of something vaguely resembling political ideology. ATLA dealt with issues of poverty, non-violence and resistance in the face of oppression, while still being a show for children with magic martial arts and beautiful music. I think Korra did a few things very well, but everything else felt like squandered potential.

As for the portrayal of fascism on LOK, i recommend this video to see better why it doesn't really work because of the very clear limitations the show runners have.