5* players are the top 1% relative to their cohorts. So, they're a small percentage. In the 2011 NFL draft, however, their were seven 5* players in the first 10 picks, while only 2 were 3*.
If you look at the NFL draft in that sense, the "star rankings" get it right most of the time.
If you look at only the first 10 picks, yeah, you're right. And in general, if you're a 5 star, then you have a very high probability of going in the first or second round, whereas you have less of a probability to do so as a two or three star.
But the particular statement that I was directing those stats was that it's "rare" for a three star to be drafted in the first or second round. Although the five stars often get picked earlier, it's not uncommon to see just as many if not more two or three stars being drafted in the first or second round.
And sure, if you are a two or three star, your chances at being drafted period go way down. But nonetheless, the point was that it's not uncommon to see as many or more two and three stars being drafted in the first and second rounds as you do four and five stars.