Yes, he had an ugly Week 3 performance against the Bengals, scoring 13 points and throwing just one touchdown against two interceptions. And he's facing a Lions defense that has allowed just 13.5 Fantasy points per game against opposing quarterbacks.
But Packers quarterback Aaron Rodgers had 73 total points over his first two games. And the Lions have faced Christian Ponder, Carson Palmer, RG3, and Jay Cutler this season -- with the latter two quarterbacks throwing for over 300 yards in the last two games against the Lions.
Additionally, Rodgers has been solid against the Lions throughout his career. If you throw away the December 2010 game when the Lions knocked Rodgers out in the first half, he's averaged 279.9 passing yards in eight games against Detroit, with 19 touchdowns against four interceptions.
And if you need more stats to convince you that Rodgers should be started, there's this: in the last five years, coming off a bye, Rodgers has averaged 291.2 passing yards, with 13 touchdowns and three interceptions. Two of those games were against the Lions.