https://www.mangameslost.com/nfl-week-13-games-missed-due-injury-december-7-2016/
The Bills have lost less players per game than several teams including the Ravens. The Bills have also lost less valuable players than the Ravens per game.
Using career values for PFR, the injury impact weighted approximate value of the Bills so far is 4.161. For the Ravens, it's 9.875. Obviously, higher is worse.
Instead of using career values, we can use last years approximate value from PFR. The Bills have 1.292, whereas the Ravens have 1.734.
So what does this data mean? Fundamentally it means that the Ravens have been hit harder with injuries to players more important than those hit by the Bills. Which to make a long story short, makes injuries no excuse. If a team can be hit worse with injuries than us and still be very much alive in playoff contention, so could the Bills. Look elsewhere to assign blame.