I think watching film of a player to see how he will fit into your scheme is more important than how many stars he has. Obviously, there's a lot more than that that goes into to it. IMO, you don't go after a 5 star player just because he's a 5 star. It has to be a good fit.
Sometimes even 2 stars or less have a bigger impact than 5 stars.
Which 2015 NFL draft prospects were two-star recruits or lower? - College Football - SI.com