They are good MilSciFi reads. I enjoyed them. He also has a secondary series with the same characters:The Lost Fleet : Beyond the Frontier. This series has them dealing with aliens.
The third series, Lost Stars, is set in the same Universe but, deals with characters from the Syndicate side in Lost Fleet and how they are attempting to rebuild their worlds and stay free and independent of the old Syndicate. The Lost Stars series is my favorite of the three, but all are good.
http://www.fantasticfiction.co.uk/c/jack-campbell/
Apache