Here's my list:
1. TOAW III. Has its problems but overall I've played this more than anything.
2. SSG's Decisive Battles series. All are great games, love the Ardennes Offensive!
3. Steel Panthers: World At War. Closest thing to ASL I've seen.
4. Gary Grigsby's World at War: A World Divided. All Grigsby games are awesome.
5. Airborne Assault series. This will rate higher as I get more plays in, excellent command system.