It's an interesting thread, having read all of it.
Personally I think there is an enormous gap between Canada ---> The Rest when it comes to defence overall. Frankly, I don't think any team is remotely competitive with Canada when it comes to comparing top 4's, top 6's, top 10's, top 20's, etc. HOWEVER, Sweden is on equal ground with their top 2, in my opinion.
I am not impressed with the US defence myself, but that's just personal preference, I would take the Swedes over the US D, mostly because Lidstrom and Ohlund, to me, are exponentially more desirable than Leetch/Whatever guy you want to call #2 for the States.
That said...it doesn't really matter what looks good on paper...that's why you play the games.