It's all about limiting risk. If you don't believe that Riley's class has more risk in it then Michigan, tOSU, or Bama then your not a very good assessor of risk.
Go look at nfl.com's mock draft.
http://www.nfl.com/draft/2016/mock-drafts . There are 22 guys that they see being top 15 draft picks. Only 1 of those dudes was actually a 3 star (Kevin Dodd of Clemson). And only 50% of the guys on NFL.com's crew thinks Dodd is even a 1st round draft pick. And as you can see below, Rivals actually ends up doing a pretty freaking amazing job ranking theses kids. Almost everyone is a 4 or 5 star.
Look at these numbers (NFL.com's top 22 players in this years NFL Draft):
5 Stars : 8
4 Stars : 10
3 Stars: 1
NR: 3
Also, notice that every team that's won a title had a least 1 top 5 recruiting class that contributed to that title. Most had more than 1 and all had a couple top 15 classes. But yet some husker fans keep thinking the system is not legit. Some keep thinking we are going to find some way to cheat the system and win with a bunch of 3 star guys. It just has never worked like that. My theory is that most husker fans don't believe in the star system because lets face it, most of the time our highly ranked guys bust out. Look at the few 5 stars we've had. Lucky wasn't as good as advertised and Bo ****ed up Baker. Baker was a 5 star O-lineman & a 3 Star D-lineman. Baker's still playing in the NFL had played OT.
Anyways unless someone proves otherwise, the star system is pretty legit and appears to only getting stronger.
#1 -Tunsil Ole Miss OT - 5 Star
https://n.rivals.com/content/prospects/maple/117403
#2 Goff Cal QB - 4 Star
https://n.rivals.com/content/prospects/maple/133602
#3 Bosa tOSU DE - 4Star
https://n.rivals.com/content/prospects/maple/129378
#4 Stanley ND OT- 4Star
https://n.rivals.com/content/prospects/maple/104949
#5 Ramsey FSU CB - 5star
https://n.rivals.com/content/prospects/maple/125155
#6 Buckner Oregon DE - 4Star
https://n.rivals.com/content/prospects/maple/109508
#7 Vernon Hargreaves Florida CB - 5Star
https://n.rivals.com/content/prospects/maple/123483
#8 Myles Jack UCLA LB - 4 Star
https://n.rivals.com/content/prospects/maple/133610
#9 Laquon Treadwell Ole Miss WR - 5 Star
https://n.rivals.com/content/prospects/maple/127250
#10 Jaylon Smith ND LB - 5 Star
https://n.rivals.com/content/prospects/maple/125963
#11 Shaq Lawson Clemson DE - 5 Star
https://n.rivals.com/content/prospects/maple/119642
#12 Eli Apple tOSU CB - 4 Star
https://n.rivals.com/content/prospects/maple/120790
#13 Ezekiel Elliott tOSU RB - 4 Star
https://n.rivals.com/content/prospects/maple/135901
#14 A'Shawn Robinson Bama DT - 5 Star
https://n.rivals.com/content/prospects/maple/123086
#15 Carson Wentz NDSU- Not Rated
Can't find a rivals profile.
#16 - Reggie Ragland - Bama LB - 4 Star
https://n.rivals.com/content/prospects/maple/98588
#17 Kevin Dodd - Clemson DT - 3 Star
https://n.rivals.com/content/prospects/maple/114136
#18 Andrew Billings - Baylor DT - 4 Star
https://n.rivals.com/content/prospects/maple/114976
#19 Mackensie Alexander - Clemson CB - 4 Star
https://n.rivals.com/content/prospects/maple/130809
#20 Jack Conklin - MSU OT - NR
https://n.rivals.com/content/prospects/maple/130391
#21 Robert Nkemdiche - Ole Miss DE - 5 Star
https://n.rivals.com/content/prospects/maple/113275
#22 Paxton Lynch - Memphis QB - NR
https://n.rivals.com/content/prospects/maple/125984