Serious When is Per 36 useful applicable

Geese-Howard Knicks5:10 am Tue Aug 13 EDT Removed

Most of the time I see the stat used its for someone who has decent stats with like 5 MPG to make it seem like hes the next all star, either jokingly or for ridiculous comparisons. The stat has been around for awhile so there obviously is some use, but what is it? When should it be used for a player/comparison and how? Is there a minimum minutes per game for a player where it should be used?