To blazes with the story - what you get from FFXII is a HUGE, varied and massively detailed world where you can literally explore every last inch! People tend to dislike Vaan the She-Man as a protagonist because he doesn't really do anything more worthwhile than simply tagging along for the ride, but SO WHAT? Isn't that basically what the PLAYER is doing?
Besides, if you find the sight of Vaan and his metal bra completely unbearable, remember the new, flexible party system: You'll pretty soon have the option to boot that prettyboy out of the active party and forget about him for most of the game! (Sky pirate Balthier tends to be a popular replacement.)
To sum it up: You've got yourself a great console and a great game. All you need to do now is relax and enjoy! Give FFXII a chance - if you hate it, you can always get another game! Now that the PS3 is large and in charge, you can get dirt-cheap PS2 games by the bucketload on eBay and in game shops everywhere!
Oh, and congratulations on your new PS2! Years of gaming glory await!