In D2, I recruited a center with a 471 rating (not ranked), red-shirted him, then he won national freshman of the year the following year along with several other accolades over his career.
He played 3 years with a PG I recruited with a 522 rating (ranked 165). That PG got national player of the year his SR year and drafted 28th in the NBA draft.
So while ratings and rankings are a neat number to look at, they mostly are misleading.