Randi is not all he's cracked up to be either.  Time and again many an excellent psychic/medium has proven their point and he ignores the evidence.  

Sylvia Browne has so much publicity there is bound to be the good, the bad, the ugly about it all.  We can all find faults if we look.  Perhaps just accepting what helped us and moving on would be best?

Don't throw the baby out with the bath water.  Keep what feels right.  You might try putting your hand over your heart. Take a deep breath, let it out and ask for the highest guidance thru your heart.  Look at each book, or any books, people, readers, etc. you are interested in reading, working with, and then ask your heart to give you an answer.  Not your head, just your heart.  Is it right for you.  What is right for you may not be for someone else.
Does it resonate for you?  
I wouldn't focus on one person and their teachings.  
If something just doesn't feel right for me, I put it on the back burner.  Maybe another day it will be just what I'm searching for.

Trust yourself.  Trust your heart.