I went to DLS 1966-73 and have also read the posts on Sheffield forum, many of which are negative. Personally, I enjoyed my time there; there were ups and downs as at any school, but I believe it instilled in me a mantra of 'life-long learning' and by stretching the pupils such as me, gave them a valuable step up in life.
Attached is a group of school photos from 1972 for anyone interested. I am Andy Cotton on Q1972d.