It's still weird for me personally. I think the same thing is true for a lot of fans. Obvously I'm happy about a 4-0 start but you'd be shocked at how muted my response to Favre's play has been. Same goes for the Vikes fans in my fantasy league. Honestly, it was just so much FUN to hate Favre as a Packer that it takes the edge off rooting for him now.
Of course the one Bears fan in the league looks like he's ready to vomit Favre and the Vikes are discusse, and they are ALWAYS being discussed.