Mercurius
Legend
I'm not really sure what you mean here, re: "tonal pitch."It's not actually possible to try too hard to emulate the Marvel films, merely succeeding to do so or failing to do so. Not trying hard enough to emulate them is the greater failure, particularly for D&D which has always had the same tonal pitch as Marvel material, from OD&D onwards (heck, the OD&D artist just plagiarized their favorite Marvel artists oftentimes).
My concern is about emulating certain elements of Marvel films that are borne out of the context of the MCU. They work for MCU, but I don't think would work for fantasy - even D&D.
As far as the "tonal pitch," I'm not sure there is a one-size-fits-all for D&D. There's almost always humor at the tables I've played at, but most of the time it is between the players, not the characters. MCU humor, by the nature of the medium, is between the characters, although referential and winking at the audience. That is my concern, and think it will probably not work, or at least not be to my taste. Meaning, in-game jokes are fine at the table, but I don't want to see them on the screen. I'd rather be immersed in the world of the story and not be reminded "this is a D&D movie!"