You just have to understand that it comes to speculative theory and that Greene does not confront the theory to the existing or concurrent (LQG, etc.) and therefore not self-critical.
Translation also feels that is not literal, textual, and some twists on French have removed what was the specificity of the English text. That said, congratulations for the translator because it is a long and difficult work in this field.
Elegant universe contains many technical concepts (in my opinion a bit more than the hidden reality) and it even includes a glossary, something that is scarce.
References to history (relativity, quantum) is accurate and complete and describes in detail the strings, including historical, which also makes a reference.
This book is illustrated (not as much Hawking and a nut shell but a little more than the hidden reality).
It is the Weinberg gauge and Kaku or Hawking.
Given the number of concepts discussed, this work ideally requires the tank level and be able to tell the difference between a particle and a field of relativity and quantum, entropy and information symmetry and supersymmetry, although Greene made the effort to remain non-mathematical and expounds thus pretty well.
Compared to his other book The hidden reality, say The elegant universe should be read second, but it is a detail because the two have much in common.
Finally, for those who still have good eyes, the French version of Robert Laffont is also written in character a little smaller than the hidden reality (and the work is also heavier), which I prefer, text appearing more condensed.
In all cases it is a book that will make you vibrate and deserves to be included in any good library.
To read without moderation.