Scifi & space opera series that I've enjoyed:
David Weber - Honor Harrington series
David Weber & John Ringo - Empire of Man series
Sharon Lee & Steve Miller - Liaden Universe series
Catherine Asaro - Saga of the Skolian Empire series
Jack Campbell - Lost Fleet series
Joel Shepherd - Cassandra Kresnov series
Nathan Lowell - Trader Tales of the Solar Clipper series
S. J. MacDonald - Fourth Fleet Irregulars
Michael R. Hicks - In Her Name series
Steven Hunt - Sliding Void series
Jean Johnson - Theirs Not To Reason Why series
R. M. Meluch - USS Merrimack series
Tanya Huff - Confederation series
Elizabeth Moon - Vatta's War series
Elizabeth Moon - Serrano Legacy series
Alex Scarrow - Ellie Quinn series
John Scalzi - Old Man's War series
Mike Shepherd - Kris Longknife series
Dana Stabenow - Star Svensdotter series
Ian Whates - Noise series
Karen Traviss - Wess'har series
Rachel Bach - Paradox series
James S. A. Corey - Expanse series
Debra Doyle & James D. MacDonald - Mageworlds series
Chris Moriarty - Spin series
Kristine Smith - Jani Kilian series