Here is how I would have made this movie. First of all, cut out all the stupid jokes and Korg narration. The humor can be naturally woven into the movie.
The movie opens on Jane Foster, catching up with her not with a montage or flashback but in the present day. She's living her life, doing her brilliant science stuff, winning awards, and you really get to know what kind of person she is. One day, she falls ill and learns that she has cancer, and no one finds this funny at all, not even in a 50/50 way. Remember there are going to be enough jokes here with Taika Watiti directing, so Jane is sick. Through happenstance, Thor wants to find out how Jane is doing. Hell, this might be a great chance for Peter Quill and Thor to share something they have in common. (seriously, how is this not a moment in the film. They are both in the movie and have loved ones facing death due to cancer) Thor tells the Guardians that he has to see to his old flame. Thor wants to save Jane, but it is clear that she wants nothing to do with him. She wants to die alone, but Thor doesn't give up. He searches the universe for anything that could save her.
Meanwhile, we meet Gorr not through that absolutely awful scene at the beginning of this movie, but at the present time. He is as menacing and scary as can be, and he has a plan to destroy all gods. We briefly see why he is this way, but just like with this movie, we don't much care. This dude is fucking scary. Thor hears of a powerful entity that could save Jane, and goes on a great and perilous journey to find him. Thor is running out of time. When he arrives, this god appears poised to grant Thor his wish when Gorr the God Butcher arrives. He slaughters the god and leaves Thor bloody and broken on the steps, as it seems he has failed to save Jane's life. Gorr invades Earth and steals some kids, I guess? They don't really need to fight in my version because that is dumb.
Back on Earth, Valkyrie hears about Thor's quest and tells Jane. Jane is determined not to spend her last moments just waiting to die, and wants to help. Through the magic of Thor's broken hammer, Jane becomes the Mighty Thor. She goes on a quest with Valkyrie and kicks the shit out of Gorr.
In the last scene, Thor walks to the gravestone of Jane Foster and says some touching words.
You could insert all the little jokes you wanted in there provided they were funny. My story might be the most bog standard way to tell this story but I would have preferred it to what we got.
