I wouldn't say we have far, far less talent on offense.
True, we don't have Diggs, and that's tough. We also don't have Sherfield or Harty anymore, and I don't see that as a negative.
I think that Ray Davis is an upgrade at Running Back, and bringing back Ty Johnson is a plus, although I'm still cheering for Darrynton Evans to get a chance.
Getting Curtis Samuel helps a lot, Mack Hollins is okay, as is Valdes-Scantling.
Overall, there is less talent for sure, but I don't think it's as bad as you are implying.