OK, let's break this down.
Who you're referring to when you talk about people watching film and issuing an opinion are...fans.
Who you're referring to as the "the people who get paid to judge recruiting classes" get paid by....again, fans. If they were paid by coaches, then you'd have something. But coaches have no use for them, and little respect for them either.
The only way you can say the recruiting services tend to be right is by pointing to the success of 5-star guys versus 2-3 star guys, overall. But that's no big deal. You or I, or our grandmothers for that matter, can ID the 5-star guys, so that's not an accomplishment worth noting.
Now, most D1 recruits are 3-star guys. When someone can come along and look at a list of 3-star guys produced by the recruiting services and tell us which 3-star guys will be successful, and which will fail, then I'll buy in, and say these guys are good.
Do you know who can ID the good 3-star guys? Some coaches can. The ones at Wisky, TCU, Michigan State are damn good at it. Coaches at places like Illinois pretty consistently suck at it.
I'm in the camp of thinking Narduzzi is pretty good at it too.