@Marvelus This version of Thor was good, but I think you miss a crucial part of his character in this film. Yes, he has finally become King, something that has been apart of his character arc since the first movie, but it didn't mean he was ready for it.
Thor was always told he was destined to be King, which led him to be arrogant about it until he learnt humanity and refused the position. Then because of circumstance, the position is forced on him, so he accepts it (plus he has grown).
However, almost immediately, half of his people (including his brother) are massacred, leading to him acting purely out of revenge, unlike what a good King should do. When he finally confronts Thanos, instead of killing him or taking the stones, he only wounds him so he can express his revenge to him, and that is why he fails.
This failure, followed by killing Thanos later on for no reason but rage, leads to all of his inability to handle loss to overwhelm him, throwing Thor into a deep state of depression. Thor is then unable to lead his people as King because he never understood how to handle loss and failure.
Then, when he talks with his mother, he understands to deal with this, as well as learning to not be something others want you to be. but just be who you are.
With this realisation, Thor understands that he is not meant to be King, and that he never was. That is why he decided to find his path, appointing Valkyrie as the King of Asgard.
I know people think this Thor is epic ("Bring me Thanos!"), but I honestly think it's a great misunderstanding of the character. We think Thor is doing the right thing, and we enjoy watching him, but really, he is not acting with the right mindset. And that's fine. This is why I love this character so much, because of his flaws. This is not the perfect Thor.... there isn't one. I feel like Love and Thunder will provide us with the Thor who has found who he truely is.