The mudslinging apparently started as a dispute over where the Vapor barrier belongs and why winnepegreno would want to replace the wood siding on his home with osb before he covers it with vinyl siding....
I gotta say, I'm with the Inspector on this one. The vapor barrier is already on the batts if you buy the kraft faced batts. tearing off the old siding and replacing it with osb will lend strength to the walls but it does seem like overkill. Unlike inspectorD though, I consider plastic a good thing in certain situations. As in, flashing from under the wall sheathing, down and out to the weeps in a brick wall. BUT I agree that felt paper is an adequate choice for an exterior moisture barrier. Foam board is always a good choice behind vinyl siding and tyvec is... well, in my opinion, not worth the extra money and should actually be free because the manufacturer or the supplier certainly uses it to advertise themselves all over your home until the finished siding covers it all
So repeat after old Square Eye
"Drywall, vapor barrier, insulation, wall sheathing, moisture barrier, foam insulation, vinyl siding."
winnepegreno, you do not have to try to apply a visqueen from outside to get an effective vapor barrier.
Sheet plastic is only useful as an interior vapor barrier or at or below grade for a moisture barrier or flashing.