In 2018, the Raiders were the worst team to own players on for fantasy football purposes. Outside of Jared Cook, nobody on the team was a consistent fantasy performer. Even Derek Carr, whose value last year came from not throwing interceptions, was limited by a total lack of weapons. The Raiders also had a skeleton crew at running back and the worst defense in the league.
This season, Oakland has the opposite situation. Cook is in New Orleans (where he should be a top fantasy option once again) but the Raiders should have an improved defense as well as an exciting rookie running back and possibly the best WR group in the league outside of Cleveland.