I don't understand; I don't care to understand; I just want to rant about it.
Addiction is intentionally built into games. Klondike Solitaire probably hit on it by accident, but Everquest, WoW, and Farmville were built to intentionally exploit the pleasure system to secure hours upon hours of attention. Other games do this to a lesser extent, but there is always a payoff for some interval of play.
Contrast this with comics, which are designed to, at worst, exploit the human tendency to fetishize particular reappearing characters. The latest issue of Captain Amazing may hold your attention for a while, but there is no built-in active mechanism triggering dopamine hits in a regular basis. Television would come the closest, and that is similarly maligned by elitists who want the whole world to know that they don't even own a TV.
I don't think there's anything wrong with this aspect of games, but it definitely puts games in a different category than the other forms of entertainment that Nabeel is holding up for comparison. I'm surprised this isn't obvious.