Listen to Favre in his own words telling everyone he does not have enough to work with. Favre basically calling Berrian out, telling him he thinks his heart is in it, but he doesn't have what it takes. He also said that there was no Chester Taylor.
To blame Favre for what is going on is totally ridiculous.
http://www.vikings.com/media-vault/videos/Favre-Presser---919/e4f14c91-78f8-4636-9632-c7f5859ae9ed
Favre is not rusty. Favre is trying his hardest. Favre is trying to make plays.
Favre has come here to win, period.
Get Favre what he needs, or get what is around him to produce at the highest level they can.
20 years in the League, at the toughest position, should warrant someone listening to what he needs.