Might have to thanks.

The most effective and accessible beginner NB build IMO is just DW/Ice with Torc of the Last Ayleid King

2H-3M-2L
Bewitched Sugar Skulls

This build slaps and has great survivability and regens. If you aren't able to be successful with this there are definitely some L2P issues to address.

I switch out sets etc depending on the BG. It's been a while since I ran one so bear with me.

If it's capture the relic, I switch out to all swift jewelry and run a more tanky high health/resists medium armor(for the swift passives) build. I use one of the healing ultimates, I think it's the Barrier from the PVP line. I just sneak in and wait for the other team to get distracted grab it and run. Sometimes I end up capturing all five relics. You are so fast when the bell chimes you can usually run to the relic, grab it and get away before the opposing team has any defenders set up if they even try. If you are new this is an easy one to learn. If you get in trouble hit barrier while running with the relic although you are so fast they usually can't catch you.

If it's deathmatch I switch out to a bomber build with Rush of Agony and Vicious Death, one bar build spin to win with Oakensoul, that way both sets are active at the time time. I usually score in the top three or so.

If it's the Chaos Ball, I switch out to more of a one versus one gank/heads up melee style build that can heal quickly, Incap, Merciless Resolve, Concealed Weapon, etc. I use the same build on the BG where you capture the location flag. (can't recall the name).

I find that switching out depending on the type of BG allows me to contribute significantly and my team wins more often than not. If you run a one bar build you can have one build style skills like the swift one set up on the front, and another build style skills like the bomber on the back. You just un-equip the oakensoul, switch to the bar you want, then re-equip it and switch out your body sets. It's fast.