What are your league settings?
Drafting Jennings in the 2nd is a stretch.... and moreso grabbing Rodgers in the 3rd! Unless you start 2 QB's or something.
I feel that Rogers is slightly overvalued this year. Last year he was airing it out like crazy b/c Grant was hindered w/ his hammy. He also ran in a good number of TD's and I think it's unlikely he'll do it as much again. I think a good spot for Rodgers is in the early 5th round.
Just giving my opinion here. Always go w/ your gut... if you feel they're gonna be a powerhouse combo this year, pick em both up. But never overvalue players b/c it will lose you the league. I also never suggest drafting guys just because you're a fan of theirs or love the team.
Best of luck!
2010 12-team .5PPR
QB - Ryan, Vick
RB - S. Greene, Forte, Stewart, F. Jones, Sproles
WR - Moss, Megatron, NYG Smith, Floyd, M. Williams (TB)
TE - Cooley
D - CIN (week to week)
K - Bironas