I think an underatted team was Ac Milan from 2003-2007, they had a lot of talented players. They had such a great defense and offense. They had superstars all over with guys like Pirlo, Gattuso, Nesta, Cafu, Dida, Kaka, Shev,Crespo. Spain struggled against Italy a few times (2008 and 2012) which shows that Italian football style would have been an issue for Barcelona if they faced them more often.
Juventus 2002/03 would eat them alive.
20 games, and 20 of them would end 1:0 for Juve.
Was that the season United won 3-0 in Turin?
Flu outbreak decimated Juve’s squad.
Italian teams going through a rut probably helped Barca alot.