Haven't played any of them as of yet (well, Halo 1 if it's anything like Reach), but some of my friends are Xbox friends and I'm pretty sure they've played and enjoyed those. Not too sure about Skyrim though.
my little brother is 9. he is such a pain when it comes to ss. he's all like. "it's my turn now!" and i'm all like "will u just SHUT UP?!" my brother is the most annoying person in the world.