I've read statements from several analysts who ought to know (ex-coaches, players, etc...), that basically boil down to the same thing. From team to team, the talent level is very even. If you look at our division alone, you can see a couple teams that have better receivers (overall), or better defensive backs. I think we have the best linebackers (on paper), and potentially the best defensive line. And if we don't have the best running backs, we're up there.
Also, if you look at Nnamdi Asomugha as an example, he was a beast in the Raider's scheme but was rather ordinary for the Eagles. It could be argued that the Eagles' talent level increased when he signed with them, but that didn't translate to the field. So the talent level doesn't always translate directly to wins.
New Orleans has it's strengths, so does Atlanta. Tampa Bay is trying hard too. And each team has weaknesses too. But overall, how close is the talent level from team to team? Do you buy in to what the analysts say?