Meaningless. Star ratings do a very good job showing a probability of success. The proof of how well they work is all over the place. They are not a predictor of how good or bad an individual player will be. Many individual players will outperform their star rating; many players will underperform compared to their star rating. That is not the point.
In the aggregate, higher rated recruits WILL outperform lower rated recruits. So when you evaluate a recruiting class, more stars means a better class, because it means a better probability of the players being able to excel at this level.