I enjoyed those games as well, but rarely could convince or coerce my friends to play. They are not particularly suited for solitary play.When I was younger, like 10-16YO, I used to spend days on end with friends playing stuff like Axis and Allies and other strategy games.
I still have several Avalon Hill games in good-to-very good condition:
Gettysburg (1964 ed.)
Jutland
Luftwaffe
Panzer Blitz
Panzer Leader
Starship Troopers
1776