NFL Most Valuable Positions

[Pudge714]

I was just reading this article
http://www.slate.com/id/2173817
And while it's final conclusion of
Quarterback
Center
Offensive tackle
Safety
Defensive tackle
Middle linebacker
Running back
Offensive guard
Rush end/linebacker
Wide receiver/receiving tight end
Kicker
Punter
Cornerback
Fullback
Blocking tight end

Is really wrong since Safety shouldn't be >>>> CB.
If protecting your QB is so important attacking the other QB should also be imperative so DE should be higher.
Centre> Tackle is really wrong.
His "recieving TE" position is should be renamed Elite TE so it suffers from selction bias.
Kicker and Punter are too high because the best kickers aren't that much more valuable than the worst.
Obviously a lot of this stuff is system dependent, but in general what positions are most valuable?