It doesn't matter who's playing or where, the experience of attending a live football game is fantastic.
I've been to a few games at Arrowhead over the years when Oakland came to play. And even though the weather sucked (it was snowing pretty good at the first one) and the seats weren't fantastic the thrill of sitting there and watching a live game was unbelievable.
I hope you enjoy the game and since you'll be in Oakland....take extra care, eh?
I hear the fans are rough.