The key here is obvious. The sniper rifle. A lot of it depends on where the fights break out since fights tend to stay near one place for the most part, but most of the time the beam rifle seems to be the more important of the 2. (Not always though) The base seems to be where at least 75% of the battles take place so definately get that sniper and either take it up to the top where you can cover your mates actively fighting or if you have control of both snipers that purple tower actually is the best viewpoint on the map. Okay, once the sniper is established, the next thing on the agenda is taking the base. You are elevated above the enemy allowing you to simply back away if you are caught offguard by an enemy below. Also, there are only a limited number of access points for the enemies to get at you so it's fairly easy to defend. Especially with a sniper telling you where people are coming from while he drops the enemy all over the place. There is a plasma pistol that spawns on top of the base so a combo is easily accesible as well as a ghost and if you hop through the portal below there is another plasma pistol right there for the taking. If you get really ambitious you can hop off and grab the rockets. (The ghost rider is a perfect candidate for that)
99% of the battles are just straight up BR fights, so being skilled with that and possible traveling within gunshot of another person for backup will make the difference.
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