Video games are about abstraction. The gamer takes a controller or keyboard and mouse and is suddenly put into the role of a superhero, soldier, or plumber downing mushrooms to grow big enough to take down a princess-stealing dinosaur. One can travel to distant galaxies or stick around at home, making life more comfortable for simulated humans with consumer products and love. There is a literal fourth wall—the screen between TV/Monitor—with a game on one side and a player on the other.
This is why controls are so important to a title. Good controls remove one more barrier between a player and the gaming world. Bad controls take a player out of a game, like seeing a boom shadow in a film. The illusion is shattered. Frustration replaces aspiration. It takes time to learn the controls of a game, of course, but if the design sensibility matches the learning curve, the transition becomes seamless.