One thing most decently made hollywood movies did right in regards to war, is when they show soldiers taking fire and not "Stalone'ing" through mg crossfire (mg stands for machine gun if you encounter anybody typing or saying that a lot)
Sit still, take cover, don't expose a frig'n toe or someone will take that toe away from you.
Take a second and think about your options. Wait and estimate by sound, any footsteps, gun fire direction, when an enemy is about to empty their clip, when they are reloading.....
Don't be afraid to ask for help, and not just for tips, but from team mates to help take something out that you can't, because eventually, you'll soon have a chance to pay the favor back & take out some enemies pinning them.
Don't just feel like you have to run out and kill a few guys to rack up a score. Your doing enough by not getting killed, not taking you tickets down and being one more person in a cap zone, which can make all the difference in a game.
Take someone out the moment you see them, because if you can see them, than they can see you.
Most importantly: learn which uniforms go to which country. you team in a map can have several uniforms running around with different colours.
Killing a team mate in this game is very costly and is frowned upon much more than in other games, so say you're sorry when you do it, because after a while, if nobody forgives your tk's, you're off the server in most cases.
RO is simply nothing if not involving, and it also comes with personal enjoyment when you do eventually have the highest points than anyone else in a round.
I had that happen last night. I know I didn't kill the most enemies, but I helped get all the caps and took down enough enemies to top the ranks of both team's players.
Getting the most kills, isn't the objective in most of the game.
Enjoy