Whenever I heal I'll dps when I can and I heal as needed, but I try to minimize my MP consumption in the process so I can keep going rather than burn it all out unnecessarily and risk being unable to heal when I need to. If people have a problem with how I do things I will either alter if their concern has merit or ignore their whining if it does not and what I am doing is fine. I normally run easy content though so I don't often get those bad PUGs, but I feel for the people that do.