Asklemmy

Yeah, the entire story follows the major beats of a group of people playing DND. Everything that happens would be familiar to a player. Your party always gets captured and thrown in a prison from where you must escape. Dungeon Masters (the people running the game) will frequently introduce an overpowered "helper" NPC to move the party along in the right direction, but that character won't engage in the fights. Parties will find several puzzles that the DM has spent hours creating, only for the party to use some magic or tool in a creative way to bypass the entire puzzle.

To someone expecting standard fantasy storytelling, it's jarring and weird. The anachronistic language, the character decisions that don't make sense, the magic artifacts that seem to just happen to be exactly what the party needs in the moment, it's all stuff that would happen around a table in someone's basement. It helps to think of each character as a regular person you know today playing a game where they make all the decisions for the character. Convenient contrivances or frustrating failures are the DM having fun with the story. Sometimes the dice rolls 20 and you do something miraculous, and sometimes you roll a 1, trip over a pebble and stab yourself in the face.

You don't have to be a dnd player to enjoy the movie, but you do need to understand the lens through which you're watching it. Otherwise, the tone and pacing seem really strange.