I don't see why everyone hates XII so much.
The story was a little convoluted, but I would hardly call it weak or cliched.
The battle system was, in my opinion, basically the same as the ATB system (assuming you've deactived the gambits which were, let's be honest, absolutely rubbish in a boss battle, and if you're fighting a number of different enemies) except everyone moves around a bit more.
The Star Wars-esque air battles weren't 'bad' per se; if every epic air battle was considered a rip-off of Star Wars, then how are we ever going to find anything exciting that's completely original? There's only so many ways to portray a concept without someone shouting plagiarism.
It was interesting to portray the story from Vaan's point of view, but I think it also gave the player a simply unbiased view of Ashe's dilemmas throughout the story. The only character I really have trouble with is Penelo. I mean, what was the point to her being there? As far as I can tell, she basically only joined because she wanted an adventure. I mean, wanting a little excitement is fair enough, but why are 'we' supposed to care?
And one other thing. I still haven;t quite worked out how Fran manages to walk across an entire continent wearing high heels.
Otherwise I found it completely and utterly enjoyable.