I've found that I really need to learn some of these maps better. At least I think it's the maps. Could also be a loadout issue.
Whether I get put on a winning or losing team, my own performance will fluctuate madly. I mostly play attrition.
I am terrible on the training grounds. I'm not bad on corporate and one of the city maps. Like 0/10 K/D on maps I don't know to 10/1 on maps I do. Typing it out, I just need to find out what playstyle suits each map best.
I generally do better on hard point, but I actually stick around and hold a point. That's my ideal strategy. Top three killers should do most of the killing, and one member sticks around to defend a hardpoint after it's taken. Once you've got all three, the killers can roam and help defend as needed.
Particle wall has made my Ogre a killing fiend, though. Mostly survived a three on one encounter by throwing up a wall and taking care of the guy behind me, then letting loose on the other two. Doomed two, eventually had to eject and took some AI out in the nuclear blast. I was also lucky in that I had a good position when they converged. Other items are the shield recharge, lock-on missile, grenade launcer (fantastic against Titans, lousy against pilots for the most part, for me), and I think the core extender.