The myth of Osborne not having top classes is just that, a myth. His classes were never top 1 or 2. But he consistantly finished anywhere from 8-25. I think 3rd might have been the best he did. Dont quote me on that. IIRC that was what it was.
i'm pretty sure at least one, and probably a couple, were considered at the time to be the top class in the nation.
I don't know about the 80's, but our recruiting rankings from 1990-1997 were 10th, 28th, 14th, 18th, 20th, 8th, 6th, and 19th according to SuperPrep. The majority of players from the domininant '95 team were from classes ranked 28th, 14th, 18th, and 20th. Now that was a different world in terms of recruiting coverage than it is today, so it's probably not like comparing apples to apples.
This brings me to EZ-E's post about Osborne's top recruiting classes being a myth. 8-25 is quite the range, and there is a significant on paper difference between the high and low. If 20-25 is a top recruiting class, I think Bo will meet or exceed this in most years. If the mark is 1-15, TO was batting .500 for the time period that I posted. It remains to be seen if Bo can match this in the long term.