I just played a game of control Iron Banner and the end of the game the scores where Opposition : 17035 and my team : 15320.
My team had a total of 12 captures, 60 kills and 20 assists, their team had 4 captures, 86 kills and 31 assists. They won the game but all they did was camp base A and occasionally nab one base a couple of times. In a game of control which is all about capturing bases how can they win purely by getting kills? We had two bases the entire -blam!-ing game and they just camped with snipers and yet they still won. How is this an objective based game if kills alone could win it? This means that it is theoretically possible to win any game type by simply getting enough kills to outweigh the oppositions objective based points.
It actually means in some cases when you are unable to capture a base that you are far better off to camp it out and wait for them to come to you, especially on a map that allows a sniper to overwatch two bases from one spot.