Well, actually, it is. I don't believe Rivals or Scout really have the experts in many cases, nor the time to properly rate kids. And even if they did, do you think a top talent evaluator is working for Rivals rather than USC? I don't think so. A couple of the guys are actually pretty good, but the offer list is what they are going by most of the time. When they do look at film it's often the same film we are looking at - highlites only.
It's much easier to evaluate their offer list and assign a rating.
Secondly, the only information they get in terms of who has offers and where they are from is from the kids themselves. Sometimes a HS coach provides information as well.
Helped a local kid's family a few years ago with the recruiting maze and helped them setup his profile with Scout and Rivals. Never submitted film to the services. Told the truth on Height, Weight, and 40-yard dash time. Kid played for a 4A school here in state and didn't get too much recognition in the press. Attended 5 camps and got 4 offers, 2 of which were BCS - never reported them to the services. He went to one of those camps, liked the coaches, and committed. End of recruitment. Rivals and Scout reported none of this, and they only reported the offer from the school he committed to (non-BCS). Yet, somehow, they assigned him 2-stars and a 5.x rating. That's what a kid with 1 offer from a non-BCS D1 school is supposed to get. There is no chance they saw him, knew what he looked like, etc. And the same thing is happening with Clay Norgard. Do you think Rivals has looked at full game tape of Norgard going up against the top OL in Colorado to do an unbiased rating? The resources just aren't there.