It's been more than a year since I read Omega (a series that I thought had ended). I found myself a bit lost with this one. I should have read Omega Force first (a separate, but not, series). I think (in part) that's why I didn't enjoy this as much.
I thought the romance was wishy-washy. It starts out appearing to be a Cage/Melissa pairing. Then she and Mark make-up and she disappears from the plot line. This just didn't do it for me. The first 3 books in this series were so much better.