To me Korra is a very likeable character instead.
Obviously she is not an Aaang copy.
More specifically, Aang was first a young Air Monk, and then the Avatar. All that Aang wanted to be was an Air Nomad. He discovered to be the Avatar at the age of twelve, and he never really wanted to be it. His scale of values is that of an Air Nomad and nothing else. Aang can be lazy, selfish, love to have fun, but his morality is rigid and Unbreakable. We know perfectly well that he will never allow his alleged duties as the Avatar to lead him to do something that goes against it. His adherence to the moral principles of the Air Nomads works for him as a guide, giving wisdom seemingly beyond his age.
On the contrary, Korra discovered to be the Avatar at the age of four. Probably she does not remember ever being anything other than the Avatar, and the Avatar is what she has always wanted to be. For this very reason, however, Korra is much more used tha Aang to consider her duties as Avatar as something that can go against hes personal preferences (consider that a girl as impulsive as Korra, studied bending for thirteen years as a recluse, because she believes that this was her duty). In a certain sense, she is much more akin than Aang to the figure of the ideal Avatar evocated by Yangchen. But this, coupled with an impulsive nature, and the lack of social experience (at the age of twelve, Aang had already toured most of the world), despite being older than the Aang of ATLA, makes her more gullible than him.
Now in the first episode of Book 4, we see the effect of having discovered that everything she had wanted to be, and everything she has prepared to be in her entire life, ultimately, she doesn't like.