I think law school numbers attract a lot of users with high numbers. I think some people fake it, but most people should be telling the truth - as the calculated GPA and LSAT for each school based on LSN isn't that far off from the numbers schools released.
That said, I think you should use the school released information (25%, 75% and median) to get an overall idea. LSN helps to compare people with similar credentials in terms of LS admissions.