The story starts off well enough, but it does meander toward the end, and FFXII has one of the poorer endings of the series. It's all the stuff in between, though, that makes FFXII a great game.
You didn't like the ending? I thought it was the most emotional scene in the entire story.
It was disappointing and didn't seem emotional at all. I guess this is because the build up to it doesn't work so well. The antagonists are just not antagonizing.