Okami is godly awesome (pun intended).
I know you'll like it because you liked Final Fantasy XII and Shadow of the Colossus, both of which had one thing in - size. Okami has just that. It's huge and have breath-taking scenery to gaze at at every moment. Not to mention iconic and innovative, there's that too. It's not as huge as Final Fantasy XII, though, but big enough.
Anyway, just give it a chance. It starts off a little annoying because the story is a bit boring and linear at first, but around 15 hour mark, it picks up very well (by adding 15 more side-stories in the mix and putting lots of plot twists of plot twists for good measure). The gameplay becomes a lot better from there too, because you'd have unlocked a lot more techniques by then.
In the end, if you were able to sit through something like KINGDOM HEARTS (which puked mediocrity everywhere in its Disney parts), you'll definitely - in the least - be able to sit through this as well, if not less.