It is definitely worthwhile to consult the Naviance and scattegrams for colleges. It would of course be more valuable if there was a large enough sample size. However if a college has a lower acceptance rate than Stanford or Harvard in your high school, you have to look at that in more detail. The reason it matters is that you typically only apply to a handful or reaches and if the colleges are similar wrt how you feel about them, you should select ones that have the higher acceptance rate, especially if they’re substantial. That should help narrow your list as well.