The key word being, "contextual."
Nobody wants Solid Snake turning around and explaining how much he likes the delicious, refreshing flavor of Coca-Cola. But placed contextually, game ads aren't so bad, and they can even add to immersion.
"'Casual games' are something the 'Game Industry' invented to explain away the Wii success instead of actually listening or looking at what Nintendo did. There is no 'casual strategy' from Nintendo. 'Accessible strategy', yes, but ‘casual gamers’ is just the 'Game Industry''s polite way of saying what they feel: 'retarded gamers'."
-Sean Malstrom