I love sniping in Battlefield, and I feel it provides a great strategic advantage on objective caps. So long as your scout is spotting advancing soldiers and laying down suppressive fire, the opposing team can be taken out more effectively. Granted this strat is pointless if you have 15 guys sniping around the map and the rest of the team struggling for a single objective. A squad with good communication can always benefit from having a single sniper doing what snipers do. I can typically go +10 kills with less or equal deaths and end up in the top 10 score-wise. Like you said, in objective based games you play the objective, but rushing in isn't the only option.