When paratroopers jump out of chinooks, they jump from the side and down. When you eject from an attack chopper, you go up and then down, probally through the rotors.How much does the regular sniper rifle do to a buggy? I know that ramjets do tons of damage, because, obviously, it is essentially a railgun that shoots bullets instead of the railgun that shoots energy things. But regular sniper rifles shoot regular bullets.
And in my opinion, attack choppers are only good if you know how to use em. They can take out tanks and infantry easy out in the open, but in a place like city, a group of hidden snipers can easily take out a chopper in seconds. They are good for hit-and-runs tactics and base defense, but make poor attackers since they can be taken out by regular soldiers fast.