If Primera teams defence is lousy, why Lazio players played like shit against Atl.Madrid, or why Stoke city didnt break Valencia's defence, I mean, Messi showed "how lousy Primera defences are".Serie A teams have better defence but not that much.Atl.Madrid struggle to score against Real and Barselona, but showed Lazio how its done.Or you are trying to say that Atl.M would have had more problems against Siena defence and similar Italian teams.If Messi can score 4 goals against Valencia and Arsenal , be sure that he can score as many against Lecce and Novara or Genoa.