The Ohio State football team has been very successful under Ryan Day. That is undeniable. He has coached the Buckeyes to three College Football Playoffs and a National Championship Game. The Buckeyes have been good enough to win it all in some of those years too.
The problem has been winning the big games when it matters. Games against TTUN. The game against Georgia. The National Championship Game against Alabama. None of those games went the way of Ohio State. These are the ones that great coaches win.
Unfortunately, those are games that the Ohio State football team has lost.