The complaint about the adventures never being taken seriously does seem a little valid. Everything is always so light hearted that it never really seems like they actually are on a high stakes adventure. The monsters or natives are perfectly modern cosmopolitan friendly people themselves. The only real tomb raiding we see was in the pilot episode, and every other time it happened off camera like the game night episode, sky pirates episode, Ithaquack episode, or the Goldie episode.
Most are centered around the family doing random things around duckberg and getting into trouble. It needs more actual adventure and less dealing with people in town.