I generally think that Mel Kiper's draft grades are really funny because of the disproportionate number of B's and C's. He seems very hesitant to give out an A or an F. His draft grades are behind the Insider paywall over at the Worldwide Leader, but Kevin Seifert posted on Kiper's NFC North draft grades.
The Packers got a B for filling their needs and not making significant reaches for any of the guys that they drafted. Because Jerel Worthy was called a guy with a "questionable motor" before the draft and because Kiper's not sure if Nick Perry is more than a situational pass rusher, he's unwilling to hand out the A-grade, but Seifert notes that 'Worthy could turn this into a proverbial "A" draft.'
Around the internet, other NFL Draft writers had similar things to say about the Packers' draft. SI's Audibles blog gave the Packers a B+, while both FOX Sports and CBS' NFL Draft Scout gave the Packers a B.