NFL Week 15 grades: Lions get an 'A+' for upset win, Raiders get a 'B' for wild Monday walk-off win | CBS Sports Headlines NFL Week 15 grades: Lions get an 'A+' for upset win, Raiders get a 'B' for wild Monday walk-off win Here are the Week 15 grades … Continue reading NFL Week 15 grades: Lions get an 'A+' for upset win, Raiders get a 'B' for wild Monday walk-off win