I enjoyed Gladiatrix quite a bit, although there were a few things that I didn't care for. Lysandra was not a terribly sympathetic character - her arrogance was downright laughable at times. Also (spoiler ahead - highlight to read) the battle that the gladiatrices were preparing for for a good portion of the 2nd half of the book never happened, and the fight with Sorina was anticlimactic (although I wasn't surprised - I thought either they would both live or they would both die).
That said, I liked the book from the moment I started reading it, and I had a hard time putting it down when I neared the end. I will definitely watch for other books by Russell Whitfield!