Several reviews have felt that it has broken formula actually. This is what the Verge said:
"It all comes together to create a film thats simply a joy to watch, with a personality thats wholly its own. Thats no small feat, particularly given how saturated we are with superhero movies. And it is also worth noting that the quirks of Thor: Ragnarok may not be for everyone. There are no sacred cows in Waititis movie, and fans who prefer their superheroes straight-faced and without meta-commentary might chafe at its irreverence. But the willingness to play with genre tropes is one of the most exciting things about Thor: Ragnarok. Marvel felt comfortable letting Waititi bring his sensibilities to bear on the material, even if it might go a step too far for some viewers. Thats the kind of creative flexibility that has always seemed difficult for the studio to embrace. But with filmmakers like Waititi, Gunn, and Black Panther director Ryan Coogler all making their marks on the universe, perhaps were entering a phase where Marvel is embracing its directors individualistic voices instead of trying to beat them down."