BE PATIENT!
Had about 10 games so far and the opposition is always good, no more games v newbies and this is great (except when it's a premade and I am soloing

Nearly every single time we lose it's due to people running off to do stuff for no apparent reason. We had a great position on Alpine we had ECM cover, snipers and some good short range stuff, the enemy were unable to do much against us. After 5 minutes of not moving we were starting to wear the enemy down with some nice sniping....all of a sudden 2 of our guys ran off, then the DDC with ECM cover went walkies...basically the enemy then cut us all to bits.
You can't play the way you are used to playing anymore unless you were not very good in the first place, when you play against organised players you have to be very careful as they focus fire all the time. Stay low, keep together and be patient, yes this may mean the game lasts 15 minutes, so what.