Weirdly I have phases, I'll play one map and get 18 kills and 5 deaths, half hour later same map I'll get 2 kills 15 deaths. I blame the universe, its trying to balance things out lol. Best advise i can give is watch your radar. Try to keep a feel of what and who is around you, dont be afraid to retreat if you see two segments light up or two suddenly join into one. Usually means your out numbered, even if you pop one of them you'll likely die and give points away. That is unless you've got a super ready or some rocket ammo, you'll usually come out on top in those situations. Weapon wise id use a fusion rifle, a centered(ish) shot with a decent rifle usually kills in one so you dont have to worry about trying to get head shots. Start the charge as you turn a corner, if theres no one there just let the charge die. To be honest though mate i wouldnt worry to much about it, its all about having fun at the end of it, getting better just comes with practise.