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Here are my ways to be good at killzone 3 multiplayer.
#1. Test all the classes out first.Try to find which class suits you at first and after a while you can branch out to other classes.
#2.Stay close but not to close to other players for the first few hours. Always at first stay close to a seasoned veteran, but be ready to stay back and pick people off.
#3.Have a mic.It is always hard to play killzone 3 objective type games without being able to talk to your squad.
#4.Pick the medic or engieener. After a while you should consider using the medic or engieener classes because of the numerous opprtunities to earn points, and the powerful weapons they have.
#5.Save your skill points. Many times you can grow through the multiplayer for a while without using your skill points,and when there needed you could have a load of skill points to deck out your classes.
I hope my tips help you survive the helghast onslaught.