The Legacy and Inheritance trilogies by Ian Douglas are hard to beat when you're talking about the best Sci-Fi in general and in particular for Marines.
The author Ian Douglas is a former Navy Corpsman and its obvious from his writing that he spent almost his entire time with the green side...
Most sci-fi writers attempt to recreate a new universe, villains etc...Ian does that but what will appeal to the readers is his sticking with units that are familiar to all Marines. MEU's? Oh he does that but on an enter galactic level. Rules of Engagement? He talks about that issue but in regards to first contact with alien species.
Its a thrill ride and I don't think you'll be disappointed. Check it out for yourself on Amazon here.
