@CoastalRat,
Yes, Motives do matter when it comes to someone with political and financial power makes decisions impacting the lives of people who are suffering. Motives matter because they impact how you act in the times when caring for people conflicts with your primary motive.
Mother Teresa accrued a good deal of power and fame. She had political leverage, and she had control over a bureaucracy that had a considerable amount of money.
The legitimate question is, given the amount of resources and political power she had, did she really do that much good. I have a good friend who is a professor of ethics at a nursing school. He is especially upset at what Mother Teresa did, in some cases people suffered more because of her work... particularly she rejected pain management for people in her homes to the chagrin of medical professionals.
Mother Teresa had a knack at promoting her charities. She was very good at fund raising, and she gained for herself a fair amount of political leverage.
Someone whose motives are patient care and the alleviation of suffering will use this money and power in a way that helps people. Given the money and power she had, she had the ability to help a lot of people.
The question is whether Mother Teresa did that successfully given the resources she controlled, or whether her other motives took precedence over the needs of people who where suffering.