Made Anakin Skywalker a likable character
One of the biggest issues of the entire Prequel Trilogy is that Anakin Skywalker isn’t a very likable character. He starts out in The Phantom Menace as an annoying 10 year old, who constantly whines. His next incarnation is even worse. In Attack of the Clones, Anakin is an arrogant, smug Padawan with anger issues, who defies the instruction of his master Obi-Wan Kenobi. He also acts very aggressively and creepy towards Padme. It is quite shocking she ends up falling for him at the end of the film as he’s rude to her and slightly verbally abusive.
He isn’t much better in Revenge of the Sith and when he eventually succumbs to the Dark Side it isn’t one bit surprising and the fact we don’t like him that much, makes the moment lose much of its intended emotional impact.
The Clone Wars somehow made this jerky Jedi into someone we root for. Maybe it was just the fact that they gave him a Padawan learner of his own that mellowed out this rough-edged Jedi. Throughout the series, Anakin lost that arrogance, his anger was toned down and he also interacted with his master Obi-Wan like he liked him rather than loathed him.
He acted much more lovingly toward Padme and their relationship felt more natural rather than rushed and forced. If this was the Anakin we would’ve had throughout the Prequels, it would’ve made his eventual downfall all the more heart wrenching to witness.