i think when you mention the likes of gears of war and ghost recon is that sure its a shooter etc but they have a new story line, where as majority of nintendo titles its the same thing basically.
zelda has always been basically enter dungeon, kill boss, repeat, kill gannon, save princess
mario has always been basically enter level, collect star, repeat, kill bowser, save princess
dk, enter level, collect bananas, repeat, kill K.rool save DK isles and banana hoard
gears of war each game has a different story/boss, sure its gameplay genre is a shooter, but then you can say the same about mario, its a platform game, zelda is an action adventure...... you dont categorize them with other titles of the same genre so why do you categorize gears/ghost/other popular titles nintendo dont get?