I liked Thor's character in Thor 1 and in the Avengers.
The humor and character work was really the shinning aspects of their approach. Also there was a level of badassery to go along with it which it made it even more enjoyable.
I strongly disliked The Dark World because it was so uninspired and it did a disservice to the character and the franchsie. Sure it had some redeeming moments but by far the bad outweighed the good. Visually it more or less followed the same path as the first movie but there was just a general blandness about the whole thing. It was a massive misstep in the franchise and one that soured people's taste and interest in it.
Then we had Age of Ultron which i liked and they even did some decent stuff with Thor but again the shadow from the TDW loomed over the character. Thor had some interesting stuff sprinkled through but he still felt very much like an ancillary character.
I loved Ragnarok because it revitalized the franchise and the character in a big way. Ragnarok had to accomplish a lot in order to succeed... and it did just that, not only critically but box office-wise. They leaned heavily into what had worked before, the humor and Hemsworth's natural charisma. Did they lean a bit too much into the comedy angle? Yes. Did it all work? No. But for the most part it was a fresh, new, engaging and reinvigorating new take. It definitely had some flaws like a superficial brush to the drama, a unevenness to the story, some debatable narrative choices and dodgy execution of important scenes.
In the end of the day the good largely outweighed the bad. Hemsworth performance was great, the Thor stuff was a treat, cool, funny, badass... Taika's direction was fresh, funny and bold. Great characters where successfully introduced, solid character work... Out of this world visual flair, solid soundtrack, strong and overall successful creative choices throughout.
Infinity War picked up where Ragnarok left off. Largely a very different movie but one that expertly used the groundwork laid out before to create a strong and compelling story arc for the character. Thor was at his very best in IW. Strong character work. The drama was executed very well, the humor was subdued but on point and he was as badass as the fans want him to be.
AEG dealt with the repercussions of the thirst for revenge overshadowing his best judgement. It definitely was a layered and impactful look at the character. It took the moment of humanity laid out in IW by his conversation with Rocket and built on that by making the character even more human, flawed and relatable. His physical transformation is a big and understandable point of contention though. While the portrayal was funny and also tragic, it didn't hit that perfect balance because it leaned a bit too much into the misery and worthless angle. Coupled with the fact of Thor being a shadow of his former self it's easy to see why some people had their issues with this portrayal of the character.