The books actually started going down hill with the introduction of the clans and once you reach "Dark Age" it's all crap. They ruined the setting.
The Stackpole books are a must though, regardless of era. The Grey Death Legion books are good. The stuff with the Kellhounds and Kurita is good. Phelan's a poser.
Stick to the older books and it's all pretty great.
Still waiting for a Minnesota Tribe book. Guessing that won't happen until they finally save humanity from the aliens.