Soldato
COD HC was a very different beast as you could actually run and gun and pull it off due to being able to ride the more precise "netcode" and take people down before they could even react. (Can't really explain it very well but HC COD run and gunners will know what I mean).
BF4 a large degree of skill is removed due to being able to fall on the wrong side of a server tick + client update rate and end up totally unable to win an engagement as your the best part of 200ms or sometimes more behind the other player's action.
+1