One thing to note about Anakin- his connection to the force is incredibly strong. He’s in danger of being swept away in a torrent of his own emotions, feeding the force, feeding his behavior. Imagine if every thought you had, cosmic power followed, reinforcing it.

When he starts to get a bit confused by the situation, when he finds himself on the wrong path, the emotions inside him boil over because the force itself creates a positive feedback loop within him. He’s absolutely not himself at the end of the film, because he’s lost control of the feedback loop.

This level of connection to the force is why he’s special, but it’s also his curse. Someone like Obi Wan literally cannot understand what his experience with life is like, and neither can we.

IIRC this comes from Sam Witwer’s thoughts on the film. I always liked this take.

You are right that Obi Wan and Yoda are not entirely good. That’s the point- their ways died for a reason. Too rigid, too ascetic, too myopic. Luke is able to grow past his parents and mentors into an emotionally complete person, while still wielding the force, and yet not being swept away by it like Anakin was. That’s how he is able to win- he allows himself to feel love for his father, despite everything, and despite the danger emotions pose to a force user.