Interesting, enchanting and engaging. Though it might remain so only for the first play-through.
The locations and settings for the puzzles are gorgeous and pretty accurate, but the characters are very one dimensional. The voices are the only interesting things about them. They don't seem to really fit in with the surroundings, and their expressions never change, even in the cut--scenes. There are lots of extra items to collect that open up various extras in the menus. There is even a feature in the game menu that gives you interesting little history lessons about the people, places, things and events going on around you or on the history of the places you're visiting.
It's definitely worth a play-through at least once, either renting it or, being one of the cheaper games now, you could even add it to your collection. It's a nice game to relax to between mega-skill fighters and lengthy, challenging RPG's. Overall, if you enjoy puzzles, this game is an absolute, but I wouldn't recommend adding it to your collection with the plans of playing it over and over and over again. The whole game can be completed in one sitting (with a little patience) if you are decent at solving logic problems, and there isn't a lot of extra places to be intricately explored, so you can get that sense of accomplishment at completing a game, easily and quickly. Enjoy!