Sad to say but my computer power limits me to just early sims. And my favourite three are RD3D, EAW and MiG Alley.
Surprisingly there is still quite a crowd of online players for both EAW and RB3D, which is much more fun than AI.
When I do get around to upgrading my computer though Look out Forgotten Battles and Pacific Fighters.
Two of my favourite theatres.
Now if only someone could do the Pacific properly. And the Med. I was so bummed when Dynamix pulled the plug on sims, and cancelled their Mediterranean (Desert Warriors?) sim. It would have been an excellent fllow on th EAW.