Objectives is ALWAYS the way to go. Easiest example is in HvV. Go after the targeted player first, ignoring the other defenders if need be. I have gotten less kills than other players but ended up with a higher score because I killed more of the targeted players. I haven't played a lot of GA yet but I have seen in SA that I've gotten 200-300 points for taking out a ship (usually AI for that low), I've received 250-350 for taking out easier turrets (when they're part of the objective). I have learned that while the chaos and melee are fun, my higher scores are always when I am focused on the objective.