Does the success of GTA IV goes to show that you don’t need to make games for ‘casual’ audiences in order to reach the mass-market?

"The division doesn’t make sense to us; good games will usually sell and be popular, bad games will struggle – of any type or genre or style. But we still believe big, high impact games will help the industry evolve and further surpass the movie industry as the next mass-market story telling medium.
...
"We always tried to make games that anyone could pick up and play. They may, over time, reveal a lot of structural and mechanical complexity, but the first mission of more or less any Rockstar game is very easy and engaging for a reason – because new people playing the game have to be gently led into the world of 3D action games, or open world racing games or whatever. This is the way we try to cater for a mass market ­– but we are focused on making digital worlds that are fun to explore and interlaced with rich narratives, that even the most casual player can become a part of, if they want to."