I read and greatly enjoyed the first set of six Lost Fleet books. Then I read and somewhat enjoyed the first of the next set, but thought it'd be better to take a break from that, as I was more interested in the idea of the Lost Stars series. So I haven't read the later Beyond the Frontier books but have just finished my paperback of
The Lost Stars: Tarnished Knight.
On the downside/attack side: there's a kind of juvenile fetish of names, ranks, and numbers, but I'm mostly okay with that. There's an awkward romantic subplot that I could well do without and which threatens to grow. The dialog is strangely hard to read (mentally "say"). There is no real focused plot that takes actual shape in this actual book - this is another excerpt in which really nothing is resolved and the next installment is required. And it's strangely structured in that we alternate between two main protagonists for awhile until we go off with one of them for about 100 solid pages. Then we alternate briefly and go off with the other one for a long time. And then we alternate again briefly until the "end". The protagonist of the first extended section is Iceni and that section is space-oriented and is better than the second which features Drakon and is ground-oriented. Campbell demonstrates a fair but lesser talent at Army vs. Navy material. Also, there's something too "nice" about this. If the Lost Fleet is Star Trek: TNG/Star Wars, then this is Star Trek: DS9/The Empire Strikes Back and he does darken the material and complicate it, since we are dealing with post-Syndicate issues here, and there's the occasional firing squad and assassination and shaky grasp of "freedom" and all, but not enough. They start reaching for "democracy" and "justice" much too directly and easily and subordinates start speaking their minds much too soon and freely and so on.
But it's still an interesting difference from TLF. And, as intrigue-filled and sword-of-Damocles-like as TLF was, TLS is even more so. Very cloak-and-dagger oriented.
Continuing on the good side, while I didn't care for Drakon and Iceni together, each was interesting apart. And many SF books deal with the rise and fall of galactic empires in grand abstract sweeps but this did a good job of getting up close to and into the nitty-gritty of a collapsing empire and a new nucleus rising out of the rubble. There's a lot in here relevant to the Soviet collapse and more contemporary things like the "Arab Spring" and so on. And it's interesting to read about the former enemies of "Black Jack" trying to figure out how they can be more like him but not *too* much like him. He hovers over the story, popping into the characters' minds like a ghost - or a spirit of an ancestor.
So, basically, most of my expectations were met. This is strongly related to the Lost Fleet stuff but different enough from it to have an interest all its own; the darker, more ambiguous DS9 tones are there to some degree, and it was - overall - very entertaining.