Role Playing Games (Dungeons & Dragons/World of Warcraft/etc.)  

I don't say that you should not play any computer games. But there are certain negatives for it. Some games have storylines and features that are against the christian belives. Some others are very bad for children because of frightening creatures and gloomy visuals that take away the happiness in you. I have many doubts about the games you have listed. I have heard from other christian forums that D&D is not good. Also, the Warcraft games have ugly creatures and very frightening preludes in between. I have played it. It also have heroes who are regenerated at Altars, like the pagan belives, which is against the christian faith.Another point is that you should not spend too much of time for games that will make you isolated from the family and the society. Rather, find some time for sharing your happiness with your friends through physcial activity(outdoor games) which will also keep you fit.