Excellent start with an anticlimactic ending, yet I still really love this game. *Slight spoilers, possibly?*
The gameplay is very original, at least, from what I've seen. The action sequences were interesting, with the quick reaction times and the need to keep alternating buttons over long periods of time. But the big gameplay difference was the way you interact with the world around you. It made the game seem more real, as I've never pressed a button to pick up a piece of paper. Moving the analog stick isn't exactly realistic either, but it's different, and makes a bit more sense. It would be interesting to see other games utilize this feature.
The voice acting was very well done, and convincing. Nothing seemed off. The only complaint I have in this department is Tiffany's voice. It annoyed me to no end. But seeing as she was somewhat a minor character, I'll let it slide. The rest was fabulous.
The graphics weren't top notch, but they weren't awful either. I really didn't mind them, and they didn't make the game any worse.
And last but not least, the story. The beginning was great. Intriguing. As the game got farther, though, it kind of derailed from its original premise. Murder investigation, yay! Then all of a sudden, Mayan rituals and clans and Indigo Child and yes. It kind of let me down a bit, but still kept me interested. I'll admit that, as much as I loved this game, it went downhill about halfway through. The ending was pretty disappointing as well. Somehow, though, I still really enjoyed this game. A few errors in the story, but I'm grateful I played it. It really was an experience like no other, and it shouldn't be missed.