Recruiting is a numbers game. Sure, half of them didn't pan out (that's normal) - but that means with this class we still got 16 solid contributors, 6-7 were great. Bo's classes of 17-19 and consistently undersigning meant if he hit 50% of his targets (which he didn't) we still only got 8-9 contributors. Bo's classes usually included about a 40% transfer rate, a 30% hit rate, and a 30% miss rate - leaving us with 6-7 guys contributing. Look at that 2011 class we all thought was so great at the time. Out of the 11 4* recruits that made that class promising, 5 transferred, 1 never showed, 2 never managed to really contribute. On down that list you've got Pirman, Carter, Davie, Price, Allen and Bondi that never really got into the starting rotation. That leaves what, 6 out of 20 that held their own...out of what was supposed to be the anchor class for Pelini. This class is the standard of the era.
Stars correlate to potential, anyone that argues against that is being ridiculous. But ultimately it's about the numbers. You have to sign to the limit, we can't have 7 walk-ons earning scholly's in a given year.