How is the gameplay besides the battle system? ie, the towns, navigation the world, etc
Besides Rabanastre, most of the towns are not actually super complex. But some of them are still quite good. Nearly all of them seem pretty lived in, due to being well populated. And good world building comments from those inhabitants. On that sense, its up there with the better RPGs.
And nearly all of them look great. Lotes of background and architectural details. Playing it originally, it was a pretty constant "holy crap my PS2 is rendering this without a hitch". And that still rang pretty true, when I converted my save mid-game, To PCSX2 for downscaling to 1080p and some extra sweet FX and other shaders. The game is just really attractive. Cobalt blue skies and a lot of oranges and reds in the color palette.
World map is actually large, open fields of gameplay. Where you run around exploring and battling. Similar to an MMO.
You actually traverse your way to most locations. Rather than poking across a simple PSone era world map/globe. The world is well realized and reminds me of something like Guild Wars 1 in how attractive it is and how it all fits together pretty well and has more focus than some other MMOs. There is a fast travel system. But you will spend plenty of time on foot, for good reasons. And the fast travel doesn't detract from the game.
Each area segment in the world map, has had attention payed. I don't recall ever feeling like I was simply running through a bland plain with some enemies plopped there. As you can feel in some older MMO's, like everquest II. They all look great and have nice background details. Really giving you a sense of the differs terrains and parts of the world.
Many segments have out of the way caves to explore, hunts to go on, certain drops to collect, and/or are connections to towns or story advancing areas.
Dungeons in this game, IMO, are some of the best in the series. The beauty and variety of FF8, in fully polygonal, 3D spaces. With more of that dungeon crawl feel, like Kotor or the more focused MMOs.
It's a great game. Despite the development hell it went through, my only real issue is that the plot barely moves in the mid chunk of the game. But you still have plenty to do and see.