I remember it being very negative in that most posts that you’d see just scrolling through it were complains along the lines of “ADHD is the worst” and “just been fired for the fifth time” and it wasn’t until my husband noted that he had heard it being a terrible sub that I realised the atmosphere was purposely that way. They discouraged self-diagnosis to the extend that seemed unhelpful, even though it could be argued that how can someone seek a diagnosis if they don’t first self-diagnose? And generally seemed to consider ADHD as a curse or a disability, regardless of whether and individual would feel that way. They were openly against neurodivergence as a term:

“We consider the neurodiversity paradigm to be harmful to people with ADHD, both directly in terms of its stated goals and indirectly via constant attempts to silence us for disagreeing with them.”