Well, I deliberately didn’t name names because I didn’t want to disparage somebody’s favourite rules. One that springs to mind is 1644. It has been decades since I played them, and thought they were wonderful, back in the salad days. Upon re-reading them, I was appalled. I do admit the campaign system – especially the lovely drawings by one or both of the Perry’s – is quite nice. As is their artwork scattered throughout.
Or the first edition of Polemos’ GNW. Quite a different kettle of fish from the new version I am given to understand. Reread them a while ago, and was again surprised with the amount of dirt contained within that I didn’t really recall. Even though I had played them when they came out, and enjoyed them, nowadays I found I couldn’t actually force myself to wade through them again to use them for some newly raised GNW armies.
As a point of comparison, to replace those sets we’ve settled on “For King & Parliament” and “Maurice” for the most part.