Through 11 games, the 2014 Buckeye defense has given up 1,626 rushing yards and 19 rushing TDs on 395 attempts (4.1 ypc).
In 14 games, the 2002 Buckeye defense gave up 1,088 rushing yards and 5 rushing TDs on 418 attempts (2.6 ypc).
The 2002 defense faced Larry Johnson, Chris Perry, and Willis McGahee.
In 2002, Larry Johnson rushed for 2,087 yards and 20 TD on 271 attempts (7.7 ypc), was an All American and Maxwell Award winner and a 1st round selection in 2003 NFL draft. The Buckeyes held Johnson to 16 carries for 66 yards (4.1 ypc) and 1 TD.
In 2002, Chris Perry rushed for 1,110 yards and 14 TD on 267 attempts (4.2 ypc). Perry would become an All American in 2003 and a 1st round selection in the 2004 NFL draft. The Buckeyes held Perry to 28 carries for 76 yards (2.7 ypc) and 0 TD.
In 2002, Willis McGahee rushed for 1,753 yards and 28 TD on 282 attempts (6.2 ypc). McGahee was an All American and a 1st round selection in the 2003 NFL draft. The Buckeyes held McGahee to 20 carries for 67 yards (3.35 ypc) and 1 TD.
The only back who went for over 100 yards against the 2002 defense was Wisconsin's Anthony Davis, who had 25 carries for 144 yards (5.8 ypc) and a TD. As a sophomore in 2002, Davis had 1,555 yards and 13 TDs on 300 attempts (5.2 ypc); his college career was derailed by injuries during his final two seasons.
So Ohio State faced an excellent set of running backs in 2002, and held them in check. The 2014 defense had not had similar success with guys like Jeremy Langford (18 attempts, 137 yards, 3 TD, 7.6 ypc); David Cobb (27 attempts, 145 yards, 3 TD, 5.4 ypc); and Tevin Coleman (27 attempts, 228 yards, 3 TD, 8.4 ypc).
The 2014 defense just isn't very good by Ohio State standards.