Well, that's... interesting.
FF XII had a lot of problems:
1) The story was dull, combining bullshit politics with magic and evil gods, all the while introducing pointless 'plot twists'.
2) The characters were uninteresting - and I'm talking everyone, not just Vaan and Penelo (but, yeah, those two annoying orphens have no reason to be in this 'story' whatsoever). Basch has the whole evil twin thing going on (really?!), Ashe is an unlikeable ***** whose entire arc (tens of hours) is a stupid "will she, won't she"-shtick that ends with her doing what everyone in their right mind already KNEW she was going to do. Fran has this whole "exiled elf"-shtick , but they don't really do anything with it - she's the only non-human in the team because Square-Enix' throught process goes like this: "Hey, should we put in a playable Seeq, Bangaa or Moogle? Nah, xenophobia all the way, give them five humans and put in a female of the Playboy bunny race." And Balthier fills in the spot as the 'reluctant hero' with many secrets in his past. What secrets? Well, he used to be a judge... which goes nowhere. He's Cid's son... which also goes nowhere. Oh, spoilers by the way. Though, to be honest, it's all so pointless chances are you'll forget about it as soon as you leave this page. Why do people like him again? Because he tries so hard to be Han solo?
3) The pacing sucks. I remember this one part where you have to go through like four dungeons - and then to compensate for that, they stick you in a huge city for over two hours afterwards.
4) The combat was broken. Magic queues while physical attacks keep going. The weaknesses of the ADB-system really start to show when you attack larger groups of enemies.
5) The summons are worthless and the quickening system is just a weird gameplay mechanic that feels really tacked on. It's not as game breaking as the limits of FF VII or the limit breaks of FF VIII, but it just feels really out of place.
6) The bazaar system sucks. The best gear is acquired through this system, but unless you're using a guide, you're fucked.
7) The areas are rather... boring. There's a beach, a steppe, a jungle, a forest, a few deserts... Compare this to FF IX where you had the likes of Ipsen's Castle, the Lifa Tree, Cleyra's Trunk / Settlement and Oeilvert. The same goes for the music, I can hum like half of the songs from FF-games where Nobuo Uematsu did the OST, but FF XII? I honestly can't think of a single theme.
Yet... Despite all of these glaring flaws... I still have a 200 hours playthorugh sitting on my old memory card.