Every league is different, you have to remember a lot of the stats D put up are the same forwards put up, and forwards almost always put up more of them.
Just short of the top-tier defensemen you are better off with a forward in a lot of cases at lower rounds. You shouldn't fill your D with 4 nobodies, but you can take the chance of only have 1-2 decent d-men and then picking some hot hands throughout the season. Your goalies and forwards are more important for the most part.
Oh i do, but i've been able to get guys like Letang and even Keith after getting 4 higher end forwards and an elite goalie in a lot of mocks.
And my first round pick is definitely Erik Christensen. Just wait until he clicks with Gabby.