I can't exactly pinpoint what it was what didn't make me love this book, but I think it has something to do with how there just wasn't enough substance outside of the romance for me to really enjoy it. Marine for Hire definitely had its good moments, and for the most part, I really liked Sheri, but overall, it was just missing that spark I associate with my favorite Brazens. 
 I did like how these two didn't deny their attraction to each other and you saw that they got along very well, very quickly. I guess, it was just too easy for me, and I didn't feel the angst. Things just fell into place and that was it as far as the romance went. Sure, things got heated when Sheri inevitably finds out what Sam is hiding from her, but even that was resolved a little to easily and quickly for my taste. I also couldn't get on board with the crazy ex-husband. He's in the military, for crying out loud. I just couldn't see how he could be as crazy as how Fenske made him out to be. 
 The highlight of the book was Sheri. I really liked how Sheri struggled with being a new mom, a newly single mom, for that matter. I couldn't really understand where all her insecurities came from, but I liked how she developed and eventually believed in herself and what she could do for her children. I also loved how forthcoming she was about her sexuality. I often get tired of the innocent female who just lets the man take the lead and is too scared to start anything sexual with him first. It was refreshing to have Sheri take the reigns and show Sam a thing or two, although it wasn't anything kinky or crazy though, so no worries there. 
 I'm sure if you're a Brazen fan or just like romances with military men, you might enjoy this more than me. I just get a little picky with my Brazens, especially since I've read practically all of them, and I always look for key points in a romance novel that make it more than just about the romance. I will say I still enjoyed reading this one, despite it not being my favorite. I am curious to read the next novel in the series, which I can tell will be one of those "fake relationships turned real" kind of plot line.