The OL played poorly. They started Hanson at RG, Newman at RT, and eventually Tom at LG. Going in that was not a recipe for success against Hunter and Smith, and anyone thinking that was a better than mediocre line was being optimistic.
If you get two of Runyan, Bahk and Jenkins back in the lineup that improves things considerably both with pass and run blocking.

They got to 13 wins the last two seasons because they had a talented roster, and because Rodgers played at MVP level with an OL that kept him upright most of the time. He also didn't have two rookies and a new FA in Watkins as major parts of the receiving group.
Finally, they won by giving Jones/Dillon at least 25 touches per game (there's actually a stat about that one acmepacking posted).

On Sunday the OL didn't block well, they didn't call enough runs for Jones, and Rodgers played poorly (bad anticipation, his timing was off, he missed open receivers several times). They can fix some of those issues, and getting healthy on the OL would help.

They'll play better. Rodgers looked rusty and I think after they watch this film you'd hope a lot of lessons will be learned.