You've got it wrong if you think getting kills is what matters, which seems to be the biggest problem with this Battlefield title. People like yourself who care more about K/D than winning a match are why a lot of the true Battlefield players have stopped playing, among other issues. But I can tell you, balance is not one of them.
I did once have someone in a helicopter on Operation Firestorm, sitting high above, shooting jets and the helicopters as they spawned. It took a teammate to lock on to him to make him run away just long enough to get into a jet and blow him out of the sky. They also lost that match. I've been in plenty of matches where you just can't do anything in any aircraft because the 'TEAM' is doing as they should. It's very easy to make air vehicles completely useless in this game.
There are more COD players playing Battlefield than there are Battlefield players. If you can't tank, can't fly, and can only run-n-gun, COD is more for you. Battlefield takes an all-around player to have positive results.