I have PC emulators for all the ancient consoles i've had over the years. I like Battlefield 1942 with the desert combat mod.
Dude, do you know how rare that is now!? I started out on DC and purchased 1942 just in order to play it. I was a "hot dog" and rated #30 something for a while, based on the stats from....Battletracks or Battletracker...forgot the name. Battlefield tracks perhaps. Yeah, anyhow it's been a while. That mod was way ahead of it's time.
I went straight from that to BF2 and have pretty much limited myself to that while actual online gaming. It has a lot of typical EA quirks but overall it's solid and I love the teamwork. Dice of course were the guys who did the DC mod.