Thats how I got close to mine but instead used the Attack Chopper. Seem to get kills really fast if no one trys to take it down, where as AC-130 seems slower. More people are getting smarter (!) in terms of anti-air and I haven't been able to put a harrier in the air for much time. I would like to have the hardline perk but stopping power is more of a must for me if I'm using my SCAR.
Killstreaks can be a bit stupid at times but It's nice in the sense everyone can use them, along with whatever weapons they want (once they reach a certain level anyways).
Hopefully they release a demo on PSN/360 after Beta is done for Badcompany 2 so I can be more convinced It's worth getting into.
It's just that simple.