I've been playing Battlebit Remastered on Steam and holy shit while it looks awful it's one of the funnest FPS I have played in a while. Super fun, super smooth, and scratches the COD itch from when I was a kid. I HIGHLY reccomend it!
+1 on Battlebit. Battlefield 1942, and similarly Vietnam, were my favorite. I always felt like Dice/EA just kept gradually turning everything up to 11 after that. Battlebit feels like a well balanced, intentional concept, that balances speed, strategy, and the opportunities for ridiculous moments just right!