Could you be more specific as to why? I'm sure you have a crunchy anecdote to share :-)
She basically did the bare minimum, and let people die in her places because suffering would make them see Jesus.
Mother Theresa has caused a lot of pain and suffering. She would get world class medical treatment, while people would be dying in severe pain in her hospice and she would tell them some bs about suffering making them great.
They also had poor sanitary practices at the hospices and would contract HIV.