Favorite Battlefield game?

What is your favorite battlefield game from the series and why? I love battlefield 3 the most since it's just so nostalgic everytime I hop into a new game every once in a while!

Mine is Bad Company 2. I just found it more fun and light hearted compared to the others.

in terms of charm and gameplay, hardline. but i have a bias towards battlefield 3 because that game has taken up a large portion of my life