Sasuke having all those techniques that we don't see him train for with the little screen time he gets in the shippuden.
Summoning Hawk: not a tech but it came from nowhere.
Summoning Manda/Aoda: not a tech but came from Oro with no screen time on training for it.
Taijutsu: Copied, didn't have to train
The lightning technique he used on Itachi we don't see him train for. (I don't know the name of it)
The 9tails Susano'o was not his idea but copy an paste of Madara.
Amaterasu: It was a hand me down.
Kagetsuchi: Came from Amaterasu an we don't see him train to make that manipulation of Amaterasu.
These are things that i hate Kishi didn't let this guy train for. I like the character but for a MC he had little screen time for the techniques he displayed. He was a copy paste for some reason an i kinda hate that because those techniques are BA and he could have been more original with this character.
I like Sasuke but his character got **** on in my opinion.
Plus i like to see someone train for what they get or atlease struggle a tad bit to get to their goals. Sasuke's character did little to no struggling for what he has.