On Sunday, the rushing offense didn't look great, but there were at least some yards racked up. The passing game took a while to get going as well, but the Packers' receivers weren't plagued by drops. The defense held its own fairly well, especially considering it was missing Clay Matthews, and Calvin Johnson was able to put up another big day, but that was not the fault of any one player.
No, the dud of the week can be only one player: kicker Mason Crosby.
After a bad stretch in which he was hitting only 50% of his field goals, Crosby came out and went 1-for-3 on Sunday. Mike McCarthy even sent the offense out on the field on an early fourth down from the 31 yard line rather than letting Crosby attempt a 49-yarder. When he did get the chance to kick a 50-yarder at the end of the first half, he pushed his first attempt just to the right (despite Lions coach Jim Schwartz calling a timeout), then pulled his second attempt well to the left.
Then, with the Packers down 17-14 midway through the fourth quarter, Crosby lined up for a 38-yard attempt to tie the game. He pulled that attempt wide left as well, much to the chagrin of Packers fans everywhere. He eventually bounced back to hit a late PAT that gave the Packers a 21-20 lead, as well as a late 39-yard field goal to extend that lead to 24-20. However, there's no excuse for an NFL kicker to make one of his four (unofficial) field goal attempts, and his performance appeared to vindicate McCarthy's decision on fourth down.
Again, here is Crosby's final line: 1-3 on field goals (made: 39, missed: 50, 38), 3-3 on PATs. That happened inside a dome, in ideal kicking conditions. If you can find another legitimate dud candidate, I encourage you to do so and point him out in the comments, but I doubt that there will be anyone else worthy of consideration.