There was no fan service that I remember and bi people exist.

The Varrick was one of the more fun side characters out of both series. His old timey cockiness and immorality was really interesting.

Korra started off cocky and pampered, then got her ass handed to her time and time again, slipped into depression and came back.

The equalist movement was awesome and raised good points.

Zaheer was a cooler villain than most Aang villains.

Korra had its flaws but I thought it was enjoyable and rewatchable.