It is a conglomeration of things. First of all, I would agree with the OL being especially out of sync so far this year. They are getting no run push and are allowing a lot of pressure on passing plays, seemingly with little blitzing from the oppostion. I posted in the Shark Pool when discussing OLs that I didn't think the Saints OL was all that strong
Also, Payton doesn't seem to be as creative as he was last year on offense. Last year, he would often have Deuce deep in the I-formation, and have Bush all over the formation. This created mismatches all over the place and Brees was an excellent instrument to pick apart the defenses. He has a decent arm, but his strength is reading things quickly and getting the ball to the right place. It seems to me at least through the first few games is that he is trying to make Bush that standard HB, giving him the ball in standard formations.
On defense, I think they are the same as they were last year. The personnel added to the team at CB were not upgrades. Because of the lack of talent at LB, they bring the safeties up a lot to help the LBs, making them vulnerable to the big play. That is what happened today and what happened last year.
Passing on LB Poluzny in favor of WR Meachem is not looking to be a wise draft decision at this time.