Aside from the hocus pocus magic which became more pronounced as S.M. Stirling published more novels, there is a general agreement that the first 3 to 6 novels were good reads. Then it went downhill even though I will admit that I have read all of the novels.
As mentioned in previous posts on...
emberverse
post apocalypse
s.m. sterling alternate history books
s.m.stirling
sm stirling
sm stirling has good ideas but poor execution
stirling
world building