Problem is that too many games are child themed. Also, they put out too few games at a time.
Games that still, can be enjoyed by anyone, teenagers, adults, girls! Which is more that can be said about the majority of the games released by Sony... +18 violent realistic games that are enjoyed by a majority of male teens high on pubescent hormones & Red Bull for who blood & swearing are THE traits of adulthood.
Nintendo makes inclusive games, that can be played by anyone, including kids which is great, I'm sure you remember being a kid & playing videogames or wanting to play them.
Thank god Nintendo is here for them, I don't see X1 or PS4 having that much of games to appeal 7/8-y-old boys & girls or that can be legally purchased by them.
Only wanting +16/+18 games is a bit narcistic, the world does not revolve around the vocal "hardcore" minority.
Now I wouldn't mind Nintendo doing some +16 games on a more regular basis, they sure are suffering of a perceived "kiddie" image in a crucial demographic of gamers & that needs to be adressed, but I think they are aware of that situation hence Bayonnetta, Xenoblade X, Devil's Third, Fatal Frame, the Monster Hunter exclusivity deal with Capcom, but I agree with you, they need more of these games, while keeping making the wonderful games they have been making for the last 30 years. Zelda & Metroid are great but not enough quantity!
They also need to bag some exclusives 3rd party, while I don't agree @ all with Sony moneyhatting left & right, if it's what it takes to have great 3rd party games, Nintendo sure has the money to do it & should do it to some extent, grabbing key franchises like they already did with Monster Hunter, Dragon Quest or at least making them happen as multipatform.
Be happy that kids can play videogames greatly due to Nintendo, that should be recognized! Just my 2,5 cent ;P