The Seahawks have been a franchise since 1976. Since then, Seattle is 355-336-1. They have made the playoffs 19 times in 44 seasons. That isn’t bad and overall, Seattle has been a really good franchise. Since the 2010 season, the Seahawks have missed the playoffs just twice.
Successful NFL teams are built, of course, on excellent draft picks. A team cannot do well long=term with just one good year of a draft, they need several seasons consistently of overall good choices. Just this decade the Seahawks have chosen players like Russell Wilson and Earl Thomas and Richard Sherman and Bobby Wagner.