What are your most underrated units in the NFL/CFB?

Here are some of mine 

FSU's secondary - Carried that garbage team all season outside of Cam Akers on offense

Alabama's special teams - Played their field position game very well mainly thanks to their punter and kickoff coverage, got a ton of flack as a whole because their FG unit was garbage.

Brown's offensive line - Faced stacked boxes all season long but still managed to maul solid run defenses especially in power run schemes

OSU's running backs - every list ive found has at least 3 teams above ours in RB units in 2018. Alabama makes sense but I've seen Oklahoma and UGA above us. No thanks, Dobbins and Weber is probably the best 1-2 punch in CFB in the backfield (only close rival is the Harris bros) and they're proven and have NOT been shut down in any big games when they both get a lot of carries (USC game they were held in check but the ball control style of offense didn't seem to help).