I don't think computer games are bad. In fact, I would say most of the people who grew up playing games wondered, at some point, on how to make those games which eventually helped them discover different computer topics
I remember when I was in high school when World of Warcraft dropped, like half the guys in my class got super hooked and would stay up late every night and phone in the school work every day. Their grades just never recovered from WoW, even some of the really bright ones graduated with barely passing grades.
Though admittedly WoW was a bit of a killer cocktail, because of the social pressure to partake in raids. That kind of game was also so new, like yeah there had been MMOs before, but nothing like that, so the "WoW effect" may admittedly be a relatively unique event in gaming history.