going 3 at the back was suicide anyway but the problem was not in defense but the fact that the midfield were way to far off the barca midfield, allowing them to pick passes at will. that is where teh game was lost IMHO

but with better organisation in the middle of the park would have helped the back 4 out, they were letting Iniesta,Xavi,etc just play balls behind teh backline at will
chelsea played 2 solid banks of 4, with no space behind the midfield for Iniesta or Messi to drift into. it was as perfect tactically as you could wish for, Real on the other hand allowed the midfield all the space to play balls in behind all night and that was their downfall
ALL the backline were culpable, Ramos tried an acrobatic overhead clearance and completely missed it allowing Henry through on goal unchallenged. bad all round