Custom 3D shooter rods - look, these might look neat, but I don't want to grab someone's face to launch a ball. Probably an irrational texture thing I need to get over.
Mods/Toys/Toppers that don't match the art style - No, I don't think you should have 2000s-era videogame Batman intermixed with Keaton Batman, no, I don't want your red-colored instruction cards when the primary colors in the game are blue, black, and purple. And no, I don't want little toy cars and space ships obstructing my view of the ball or shots.