Play callers seem to get a lot of love/hate and who's in charge of calling plays is usually a big topic, so I'd say playcalling is properly rated by most people. It's the coaching that I think is underrated. Doesn't matter how good of a playcaller you are if you don't got well designed plays to call and your players are well taught in executing those plays correctly.
Rarely will you see non die hard fans giving credit to coaches other than the hc, oc, or Dc but it also guys like Kromer that have a big part in the success. Similar to the pats oline coach where he retired, their oline sucked bad, he came back and they were much improved and played a part in that super bowl run