Because they have been luckier against useless pathetic teams that want nothing more than a 0-0 draw.
I hate teams that park the bus in front of goal, makes the game boring and just because they have no ambition in life, they shouldn't make the game boring.
David Moyes should rot in hell, hope he tried to win the FA Cup and not employ the same tactic.
I felt the same way last year year when Barca played United. Man United parked the bus over both legs. Only having one shot on target. Pathetic.
Was funny when Fergie came out half time and said, we gonna run at Barca now and attack. All they did was defend defend defend.
At least you understand it now.