OK, I finished the last of the published Black Company Books, excepting Silver Spike. No spoilers follow.
I can unreservedly recommend the first three, the Books of the North. All the rest, however, are not nearly the same quality, despite being of greater quantity.
I would liken the series to Star Trek. The Original Series was great, had action, and snuck in enough "things that make you go 'Hmmm'" to give it some depth. The Next Generation devolved into people standing around talking. Talktalktalktalktalktalktalktalk. Hey, there was a battle somewhere, but instead of writing about it, let us talk some more and (as an author) I'll moon the readers who became attached to the characters/plot in the first three books.
I may read the first three again in the future, but I never will read the latter six and I can not in good faith suggest one spend the time to do so the first time around.
A great idea and good execution for the first 1/3 of the books, milked dry in the latter 2/3 of the books.
Books of the North:
The Black Company (May 1984)
Shadows Linger (October 1984)
The White Rose (April 1985)
Barrowlands:
The Silver Spike (September 1989)
Books of the South:
Shadow Games (June 1989)
Dreams of Steel (April 1990)
Books of the Glittering Stone:
Bleak Seasons (April 1996)
She Is the Darkness (September 1997)
Water Sleeps (March 1999)
Soldiers Live (July 2000)