I was aware they were crap defensively, but I also attribute that to the calibre of defenders they have. I watched them in that friendly against the Swedish team at the academy stadium earlier in the year, and immediately it was obvious how individually poor the defenders were. They had two black centre halves who were like a comedy duo, that left back with the silly moustache, and another duffer at right back I think. When Facey came on at half time he actually calmed the whole defence down somewhat.
But of course, throw a couple of loanees into a group of poor, inexperienced defenders and you have problems. I think one of the 3 designated players should have been a centre half (a Demichelis type would have been ideal - although on paper that Iraola should have had a similar effect). I can't see Vieira suddenly turning around the defence unless they get a few upgrades in.
I think the goalies decent though.