Great Gatsby for Turn of Millennium? Perhaps. But you might say it was Twilight meets House of Mirth, as well. It was all about that spooky dream of adolescence and especially, nostalgic adolescence, mixed with the tragedy of pointless wealth. There was really something unreal about a lot of it.
I liked the first 3/4ths or 4/5ths of the book pretty well, especially the author's somewhat cryptic insightful observations, the Gatsbygothic spookiness, and the reasonably good characters. Calling George a "good sport" gives a name for such fellows as the protagonists of Haruki Murakami's Norwegian Wood-class novels. The book was readable, i.e. lacking boring sections, so at the first order of book success, it passed with flying colors.
However, that last 1/4th or 1/5th caused it quite some trouble at the higher order of things, that is, how the book held together. If I thought she wrote the book a chapter at a time, in order, against a deadline, I might say she ran out of time and rushed her way through the ending, but I don't think this was the case. Nor do I think she was making it up as she went along and kind of lost interest, as I suspect was the case with Richard Bartle's InSight InFlames. Rather, I think she's stronger at observations and characters than at plot, and where she had to rely on plot, she didn't have the imagination to make something that lived up to the foreshadowing (and the promise of the strengths of the earlier book, especially the backstories). I looked her up and see that she subsequently wrote a book of short stories and has not written another novel, which makes sense.