We are told ender can have friends , but not parents. Do you think the outcome of this attitude will be good for Enders or not? What happens to children who don't have parents or good parental role models?

For Ender personally, no this isn't good for his maturation. Ender was basically being manipulated at the academy, not brought up. Any emotional or coming of age issues he faced were closely watched and manipulated to achieve a desired response, a response solely for military application against the Buggers. As you can guess, this would not be good for Ender's maturation into a young man who enters civilian society.