Could you feel attracted to a woman who has had this done?
Absolutely! It isn't the size of the breast that makes the woman, it is who she is on the inside. (I know sounds corny but true).
Would the fact that she had scars bother you?
Only if they were all puffy all of the time, then it would be kinda weird... but from my understanding when this procedure is done the scars are minimal nowadays.
But it all boils down to personal preference I guess. Personally I enjoy breasts that are smaller... Implants and big breasts really don't appeal to me at all. But mainly it should be about the woman, if she is getting a reduction because of medical reasons then her SO should understand that and not really care. JMO