There are reasons why I, and possibly why many others, enjoy spending some of their free time playing a video game. To me, it is an interactive interest that rewards the player with a feeling of accomplishment through active participation. Compared to books, TV, and movies, all major forms of entertainment in today's media, video games bring to the couch some unique features.
There are those that might consider time spent sitting on the couch with a controller in one's hand as wasted time, but let's compare it to other ways of taking in media. When did you last get to interact with one of your favorite television dramas? And not only that, but when did you feel as if you were an integral part of that series, progressing the outcome? Of the various forms of media at peoples' disposal today, the act of playing a video game is one type of entertainment that rewards the player with that sense of achieving something. You can read a good book, and take in the atmosphere laid out in the sentences on the page.