It's pushing it to say it's actually a sim, but for history buffs who also enjoy gaming and have powerful pc's... I'd say Brothers in Arms: Hell's Highway is a must. The first one was great too, but a little aged now. The game is more of a tactical sim for infantry in WW2. Some moments are better than others and it has more COD influence than it needed, but still worth it. Oh, and some cheesy dialogue too. I give it an
As for true sim: I guess IL2 was the last one I really got into. Never was very good at combat flight sims though...