[CodeWithCoffee]

Another key factor is that watching TV/movies is a fairly passive activity - whilst you do have to concentrate on what is going on, you don't have to think particularly hard about it.

On the other hand, video gaming can be a fairly active activity (depending on the game) because you far more in control over what is happening and you have to make decisions. For some people, this makes it very dull because they don't find having to think about what they are doing relaxing, whereas for other people watching TV is dull because they aren't doing anything.