I quickscope all the time but I use different strategys depending on the level,I'll give two examples. 1)Wasteland,I can snipe from anywhere independently due to all the grass. 2)Invasion,I NEVER take the high ground. I coordinate with my squad through the streets,they move up and draw the attention and I take a position and take down the defenders on the walls.(Flag Building) Then while the enemy is trying to hold track me after the kills with their own sniper,my other teammates infiltrate the opposite side and finish them off.
P.S.I can do that with an M4 ACOG if I want,or a sniper rifle.