Mark Davis had big shoes to fill as the owner of the Oakland, and, eventually, Las Vegas Raiders, after the passing of his legendary father, Al. Though Al Davis' teams were not exactly competitive toward the end of his life, he had three Super Bowls and plenty of legendary moments to fall back on.
Unfortunately, since his passing, it has been a revolving door of head coaches and general managers, which has led to exactly zero playoff wins and only two appearances in the postseason. Especially since the team relocated to Las Vegas, they've struggled with finding the right leadership pairing.