"fun but endless"
I enjoyed the first two of these books but I'm declining to read the third. They bid fair for becoming as endless Robert Jordan's "The Eye of the World" series. I liked the first couple of those, too, till I realized that there was never, ever going to be a resolution, as when the goal was accomplished, the series would end.
The Lost Fleet plots were entertaining. If you don't mind the endless repetitive permutations necessary to this sort of series and the suspicion that nothing's actually ever going to happen because the goal of getting home will be the end of the series, go for it.
Be nice if Campbell could take a tip from Bujold and Forester, and give the captain a mission, let him perform it and send him out on another one, as he battles to form the fleet into a real honest-to-god fighting Navy.
Got to say that Campbell's onto a good thing, here, professionally. But eventually he'll figure out why Arthur Conan Doyle tried to kill off Sherlock.