Read an omnibus collection of two David Weber and John Ringo novels, March Upcountry and March to the Sea. The first novel, March Upcountry, did a good job setting up convincing strengths and limitations for space marines operating without support -apart from a handful of alien natives- in a barbaric and savage jungle world. For example, the overpowering strength of their power armor and plasma guns was balanced out by the intense humidity, temperature, and unique types of fungus on the planet ate away at the power conductors on the armor and guns, limited the number of times they could be used. One part I found quite funny was when the main character said he had never been interested in archaic warfare and tactics - a nice change of pace from other military sci-fi where the authors use their main character to expound for pages and pages on Alexander the Great and Roman Legions.
Unfortunately, the second book decides all the setup in the previous book about the aliens unique physiology to the jungle world -including mucus covered skin which was a severe impediment to wearing armor- was getting in the way so the aliens ended up living like Renaissance Europeans with green skin and no problems wearing armor, and it devolved into fairly mediocre military sci-fi, with a handful of space marines using their superior technology to lead primitive allies against frankly ridiculous number of enemies (this was a problem in the first book but it wasn't as bad as the space marines had more of their advanced weaponry and it lead to a fun battle) and giving them all new military technology without the slightest concern of how the local societies will be affected. The second book also started going into way too much detail in political plots carried out by the aliens -we all know the problems will be resolved without much fuss because the authors gave the friendly aliens problems they have to unify against or be slaughtered- and too much focus on the alien characters, which made them less alien and made them feel like green humans.
(I will say I got some enjoyment out of the aliens in the first book, 10+ ft tall green skinned aliens with four arms and tusks living as savage yet noble barbarians with names such Radj Hoomas? Sounds like like both authors had a passing familiarity with the Green Martians from the John Carter of Mars series!)
First book was fun, but given how quickly the second went downhill I can't recommend it the series (admittedly the last half of the first book started going downhill, but not as fast). Jerry Pournelle's King David's Spaceship did a far better job with this style of military sci-fi in a few hundred pages and not over a thousand pages.
No list of human characters and their military structure was a big problem in keeping track of characters. The later half of the first book and the entirety of the second book also got rid of what was one of the best parts of the book so far, a strong ensemble cast of the supporting space marine grunts who were surprisingly well written. Instead of looking at those characters -which included my favorite, a vulgar gay Korean plasma gunner- those characters dropped off the map and were replaced by a rather dull collection of Serious Yet Caring Officers and Unconventional Soldier Kept For His Technical Skill with an obligatory Tough Girl Soldier Who Falls For Main Character.
I'd rate it 2/5. It kept me entertained and there was no terrible sex scenes or awkward accidental racism, and author soapboxing was kept to a minimum, but not particularly good.
Any recommendations for good military sci-fi, preferably with a focus on battles involving big starships?