Much is said about the united defence and yes they are good, but they are good when playing against strong defenders but its been shown on occassions this year that they cant cope with mobile players, torress absolutely murdered them and ud have to put the front free of barcelona into that category and thats before u start mentioning the likes of iniesta, xavi.
United are not like chelsea they dont have the capacity to defend from midfield, they are an attacking side like barca are it will be a cracking game and i think rely on who blinks first!