Another loser checking in here. I play games for 5 reasons:
Stress releif - My job can be very stressful sometimes. Iworked hard for the level of responsibility I have, but sometimes the preasure gets to be too much. When that happens, I usually go home, fire up Halo on my PC and take on some other guys over the web. It helps me work off the stress.
Intellectual challenge - Believe it or not, some games are very challenging intellectually. I'm not talking about the shooters, but rather games like Civilization where you must take a wandering tribe and build them into a Civilization capable of space travel while simultaniously managing their resources, scientific research, political system, eduational priorities, international relations. food production and a host of other aspects required for a modern civilization to grow and thrive. Now theres a game that will make you think.
Entertainment - Adventure games frequently have writing and a story that exceeds what we get on TV these days. The first Gabriel Knight game was as well written as most movies I have seen.
Escapism - A well designed game can take you to another place in much the same way Disney World does. Anyone who has played Mist knows what I am talking about. As my sister said of that game, its like you are visiting a whole new world. And anyone who loves amusment parks will find the hours flying by when playing Roller Coaster Tycoon. Imagine being able to build and manage your own theme park. This is quite possibly the most addictive game ever written.
Education - MS Flight Simlator 2003 allows me to stay current on my flying skills and learn new ones, even though I can't afford to fly real planes much anymore. My mom uses her copy of Bridge Baron to replay hands from national bridge tournaments and improve her skills.
In short, anyone who thinks gamers are losers has never seriously tried gaming. There is a type of game for every taste and talent. From puzzle solving, exploring a new world, building a civilization or simply killing the monsters and getting the treasure, there is something in gaming for any adult.
Thinking gaming is just for kids is like thinking animation is just for children (which many people do). Both opinions are formed from inaccurate preconceptions. Maybe someone could explain to me how someone could have such a poor opinion of gamers, because I just don't get it.