I do share some of the comments made by others. Some of the caracters just don't seem to come to life and feel like they have been caricatured. A few of the themes are rather conventional. Some elements don't seem very realistic either. Here is the Diadem, essentially the Empress of over 70 planets bujt, part from her favorite henchman, she doesn't seem to have any other real supporters. No armed forces of her own apart from a few guards? No Imperial Guard? How about security services or Intelligence Services? I also agree that it is a bit of a dirty trick to start a new series without mentioning this. And I go on, and on, and on...
Having said all this, I must also confess that I could hardly put the book down and I spent a couple of late nights (or rather early mornings!) to finish it. I wanted to know what exactly was the plot, how the Diadem would react to it (although that one was somewhat predictable: with maximum force!) and what would happen next. Another reason to rant after this: the ending of volume I is abrupt, with the story being somewhat cut off. Worth 3 stars for me nevertheless, because it was a page turner, despite everything else.