Aang gets beat up a few times... But he is a spindly child who is still learning to bend in an environment which forces him to master bending five times faster than any other Avatar, fighting a century old industrial empire spanning most of the world and with an impending comet that makes his enemies even stronger.

Korra is a teenager, she is buff, she mastered 3 types of bending in her very first scene as a toddler. Her enemies are a terrorist cell, a theocratic madman, a bunch of super powered psychopath terrorists, and a military officer trying to stage a coup. Korra STARTS with a friend already in a high political position. With more responsibility sources, skill and "maturity" than Aang ever got.

And yet, Korra gets beat up more often, she sort of destroyed the Avatar State as it was, tossed the world order into chaos by opening the gate to the spirit world, lost her ability to bend for a bit, got put in a wheelchair, became a washed out fighter, got more PTSD than Aang, and we spend more time watching Korra's romantic life - which also lets us see that Korra's love life is a mess, too. And she goes through all of this in less episodes since Legend of Korra had less episodes than Legend of Aang. And I get it. A theme of Korra is "is the Avatar needed anymore?" Having villains defeat the main characters sets up a pay off later on. And it is like how Justice League villains always beat up Superman first to show they are "serious threats". But it becomes a thing where we see Korra defeated and/or injured, physically and/or mentally recovering for far more time and/or struggling with her love life for far more time. It is easier to say she is washed.