NAG_YaNk,
I just started playing this game, but my K/D ratio is slighly above 1. I rarely fly, because bombing stuff over and over again is monotonous. Instead, I like to sometimes fight on the front line or defend bases and assets. I think the whole K/D thing is hyped-up, and doesnt reflect how good of a soldier you are. But if you really wanna be a better overall player, here are a few tips:
1) Always, always join a tight and cooperative squad, because you will have some sort of weapon against any military unit
2) Play as a medic so you will always have full health, but also heal teammates.
3) Keep a low profile on the battle field: use buildings as cover, bushes as concealment, and terrain as camoflauge
4) Don't rush in the middle of a firefight without checking to see where the enemies and teammates are.
5) Watch for armor and jeeps (obvious one): they love to run you over or blow your brains out, hint: dont let them see you, especially if you have no means to defeat it, ie. sniper
6) Control your bursts when using automatic fire, learn to prone/crounch
7) Learn the weapons and their limitations: You dont wanna use shotguns for longrange, and in many cases, the pistol and knive are more effective than a gun. Grenades are useful to clear a room, flag area, or make sure nobody is right around the corner.
8) Dont loiter in overused and overexploited spots, and dont stand in the middle of the base near the flag area unless you wanna be target practice for the bombers.
This one is a big one...
9) Use your minimap. Many teammates and commanders will spot enemies for you, and UAV is invaluable. I have seen many people get killed by an enemy right next to him, even after I spot the enemy multiple times.
If you are only desperate for a better ratio, try these:
1) Use armor as an engineer: You could last the whole round without dying!
2) WHORE PLANES, ATTACK CHOPPERS, AND BLACKHAWKS: Very powerful stuff, easy to repair
3) Sniper/commander: You can avoid direct combat (not much fun though)