I'm reluctant to join this heated topic bc emotion runs high on all sides :0 IMHO, the idea of rescue is noble but as with any human activity, is sometimes executed well, sometimes not. Those who have positive experiences are understandably supportive. Those with negative experiences are likely to question aspects of the process - also understandable. At any rate, these articles offer (IMO) an honest appraisal of rescue & thought I'd share them just FYI.
Why People Do Rescue:
http://www.canismajor.com/dog/ypeoresc.html
Choosing a Rescue Dog:
http://www.dogclub.co.uk/advice/rescuedog.php