This list could be a mile long, but let's look at the biggest factors.
In a game like the one that the Las Vegas Raiders played on Monday Night Football against the Dallas Cowboys in Week 11, it is hard to know where to begin when assigning blame. One could be general and just acknowledge that both the offense and defense played poorly.
One could break it down even further and point out that the offensive line and the run game were completely inept, and Las Vegas' defense really struggled against the pass.