Statistically all recruits have about a 50% pan out rate, meaning they live up to or exceed their ranking. When it's a 3* that typically means they give you a year or so of solid contribution/starts but aren't a superstar. They can obviously be superstars as well. 4* means multi year starter, big contributor, a top player for you. 5* is a stud, game changing type person.
When you look at it objectively, if 50% of your recruits pan out, having more 4/5 stars means you're performing at a higher level year after year. Between us and Texas I think we both are at/near the bottom of getting the most out of our recruits per star ranking. We've been horrible.