To me, if they wanted to make a D&D movie, it needs to contain at least a bunch of D&Disms. Game of Thrones is not a good D&D show because it lacks a focus on a "party" and "adventurers". It lacks a ragtag assortment of races and relatively plentiful magic. To me, all of those things need to be there to count as a D&D movie.
It should be a movie/TV show about an elf, a dwarf, a human, a halfling, and some sort of weird race like half-orc, dragonborn, or tiefling. They should be seeking adventure either because they are paid or for the thrill of it. They might uncover a huge plot that is way bigger than them in the process and stop it, but it should start out small.