"Fragments" offers an interesting concept, the fusing of the minds of several savants in a collective intelligence. However, a concept is not enough to sustain a book.
In my opinion, the problem with "Fragments" is a basic one. The reader never really gets to know, or care about, the characters in the story. Part of the problem may be that there are too many characters to keep track of. In any case, the people we meet in this book are never really fleshed out.