I recommend PS3 for now, wait a year for the PS4. These are some good to great games for kids and teens that I've at least tried:
The ICO & Shadow of the Colossus Collection
Little Big Planet
Ratchet & Clank Future: Tools of Destruction
Puppeteer
Ni No Kuni
Valkyria Chronicles
Persona 4 Arena Ultimax
Final Fantasy XIII
MotorStorm
Wipeout HD Fury
Tales of Graces f
Folklore
Atelier Rorona Plus: The Alchemist of Arland
Star Ocean: The Last Hope International
Child of Light
Tokyo Jungle
3-D Dot Game Heroes
Eternal Sonata
ModNation Racers
LittleBigPlanet Karting
Castle Crashers
PlayStation All-Stars Battle Royale
The Sly Collection
Sports Champions
Oddworld: Munch's Oddysee HD
Where the Wild Things Are
Fat Princess
SingStar
EyePet
Katamari Forever
Start the Party
Tumble
There's also some great Indie Games:
Journey
Brothers: A Tale of Two Sons
Flower
Don’t Starve
Braid
Trine 2
The Unfinished Swan
Machinarium
Guacamelee!
Costume Quest
Spelunky
Super Stardust HD
