That is super not true. I played both the Dragon Age 2 and Assassin's Creed browser games, which were not really informative or that interesting. I also played a ridiculous amount of FF Air Brigade, which I know is bigger in Japan than it is here, and it's just pure grinding competitive fun. They're all just addictive and stupid, like Angry Birds or Candy Crush Saga, but with a big dose of fan-service.