We'll start with the grammatical errors, of which there are MANY. And I'm not talking about things that a spell-check wouldn't find, I'm talking about missing words, verbs, and nouns, that make sentences lack any sense.
Then, the laziness of the writing. Hmmm, how should we do a recap of events in previous books? I know! Let's have one of the characters give a fleet wide speech to his entire fleet, where he explains the plot of the last THREE BOOKS! It was so ham-fisted I was actually said 'Really?' verbally when getting to this part. Idioicy like this continues.
Then let's talk about convenient details that the author leaves out. The Arduans figured out 2 books ago it was significantly more efficient to pilot fighters by remote-selnarm (it allowed them to maintain experience as opposed to dying, and allowed the fighters to have better performance without having to support a living being). But that detail seems to have been forgotten in the battle for Alpha Centuari.
The Bugs, relegated to a single starting colony a Century or two ago in book terms, now have managed to put together a massive fleet, and invade Human space. How? Who knows!?!?
The Star Union has been destroyed, because they had demilitarized. The Star Union, which spent centuries creating a reserve in previous books because they MIGHT have to fight against the Bugs again, decided they didn't need a Navy... yeah... right...
We have a very intelligent Weathermeare, who cannot understand the idea that others can be speciate/bigoted. REALLY?
I suspected, given the last book, that this book would be terrible going into it. I loved the first 3, particularly In Death Ground and Shiva Option, enough to continue. I love the world those books created. This will be the last of this series I read. Utter Garbage, I can't even think of a reedeming feature.