Part 1 and most of Part 2 Sasuke is immature, cynical, selfish, illogical and just a terrible person. Placing revenge above everything even his own health. Endangering and using every person around him without remorse and then coming back like nothing ever happened without so much as a sorry and claiming to be the next Hokage?
How people can love anything except Adult Sasuke is well beyond me.
Cliche edge lord so to speak.
Never found his character very appealing.
There are tons in NV, whose character is easily superior tbh.