Anakin’s story arc is weak. It seems like they just connected the dots in haste in the third movie. The story telling is mediocre. Which is a shame since Vader is such a legendary character 

 Agreed. Theres no real sense of tragedy in Anakin’s descent into darkness because he was a genuinely unlikable character to begin with, except for his early years. 

 Definitely. There is no explanation as to why he became so unlikable in the second movie as well.