No, star ratings aren't 100% correct, but they have a very high correlation with success.
James Proche had 111rec 1,225yds 15TD's
Cedric Byrd had 98rec 1,097yds 10TD's
Omar Bayless had 93rec 1,653yds 17TD's
Tyler Johnson had 86red 1,318yds 13TD's
Antonio Gandy-Golsen had 79rec 1,396yds 10TD's
Damonte Coxie had 76rec 1,276yds 9TD's
Tutu Atwell had 70rec 1,276yds 12TD's
Gabe Davis had 72rec 1,241yds 12TD's
Rashod Bateman had 60rec 1,219yds 11TD's
Brandon Aiyuk had 65rec 1,192yds 8TD's
Quez Watkins had 64rec 1,178yds 6TD's
Lucky Jackson had 94rec 1,133yds 4TD's
Tre Walker had 79rec 1,161yds 2TD's
None of them were 4-stars in High School, there's about 20-30 more I could name, but the point is it's possible to be productive while not being a 4/5-star WR.
Yes, stars matter. No one with half a brain would ever argue they don't, but stars don't determine your productivity especially at WR. It's more about the system you play in more than anything.
Should we try to land every high rated recruit we possibly can, absolutely 1,000%, no questions about it. But does that mean we can never take a kid that doesn't meet the high 4/5-star requirements? I certainly would hope not.
We're not in a position where we can get the pick of the litter for any player we want, therefore our coaches have to do their due diligence & find players that fit their system & can contribute early. When you have dire depth situations while simultaneously being a losing program you don't get to be as picky.