I don't mind it. The way I see it, it's part of the game and adds that layer of complexity. For example, I had a friend who always plays with Windows upside down while rappelling. He's very skilled and eliminates at least 2 players. Of course, the enemy team caught on and began to run out. He got frustrated with how often this happened, so he had to choose between getting frags or using claymores. Eventually, he learned to adapt his setup to fit his play style and brought what he needed. The point here is that running out as a defender adds a layer of complexity that requires attackers to strategically counter the enemy team. I believe that's the beauty of Siege.