For sure there are several hacks involved. Let's take tanks for example. I regularly get killed from a single rpg hits in tanks. Yet it seems to take 3-4 hits to kill the enemy while me or other players take shots at them. Same stuff happens with infantry and lighter weapons, regularly.
I'm not doubting there's hacks or not, I just never encountered one. I've been randomly killed on spawn "bad luck", or killed while in a tank in under a second because I got caught and had multiple shots from different sources hit me in rapid succession. Probably the closest thing to a hack that I've seen was a guy who managed to never die once in a game and had over 50 kills. But I'm not going to say it was hacks because I've done nearly the same thing in a tank and jet. You're nearly invulnerable in a jet if you fly right, the only thing you have to worry about is the AAA Gatling guns.
Strafing is ridiculously easy and most of the pilots in BF3 only know a flat turn. I fly circles around them. And with auto repair in Normal mode, you basically never have to land and repair like in Hardcore.