Essentially disc 1 of the original with a lot more stuff to do.
It's really good, and has a lot of the little elements of the original.
My only complaint is the translation is abismal. The subtitles don't reflect the Japanese voice over. The English subtitles were written by someone who doesn't understand the original intention. So a lot of the story is lost in translation.
Given the cost of develpment I can see why it's in parts the original story is huge and has loads of large sub plots and mini games. To expect all that is a bit unrealistic. They've added a lot of extras to it as it doesn't normally take that long to do disc 1.