If that means killing the players as soon as they spawn then I disagree. If you mean by controlling the 2 zones and leaving the third one so you know where they spawn, forcing them to come to you then I see nothing wrong with that. Now, keep in mind the context with which I am visualizing spawn killing comes from annex in gears of war 2 where some players would fight to the enemy team spawn and then shotty them as soon as they spawned.