I have family in Ohio so I follow their team closely. Holtmann inherited a Butler team that went 14-17 and went 23-11 where they eventually lost in the second round(he only received the HC job in October). Two seasons later he gave a butler another second round and sweet sixteen finish.
He took over a OSU program that was taking quickly sinking and brought it back up quickly. He finished 6th in recruiting but only received the job in June so I think it is fair to cut him some slack.
People are always going to compare Archie and Holtmann because of the timing of their hires, but I do not think you can make any sweeping judgments until 3 or 4 years have passed.