Distinguishing good from bad advice from advisors

Under the assumption that the majority of advisors mean well (I hope), how can pre-meds distinguish good advice from bad advice from an advisor? To those that have acceptances, or are in med school, or later in their careers than that, have you found your advisors to be helpful? Or did you get most of your advice from strangers on the internet?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums