FF6 has my favorite second half in the series, with its focus on exploration and decentralized story, but I also understand why some people don't like that, as it is a complete departure from the first half of the game. I also love FF3 and 4's second halves, as you hit that moment of, "Oooooooh, my. This . . . may be bigger than I expected" without the game's missing a beat, though that rather seamless transition into the second half is also why I don't like them as much as 6's second half, since it feels like more of the same rather than something new and major happening narratively.