The Oakland Raiders took a step backward in 2017, and that's OK. It happens often in a league awash with parity, especially to teams coming off sudden breakout campaigns.
The Raiders were widely expected to come back to earth after ending a 13-year playoff drought with a 12-win 2016 season. Despite that record, they ranked 10th at Football Outsiders in terms of Defense-adjusted Value Over Average (DVOA). And the same source ranked them 14th based on Pythagorean Wins, which "represent a projection of the team's expected wins based solely on points scored and allowed.