Sure, it seems like patronizing noblesse oblige in retrospect, but in 1984, AIDS was considered a plague and those stricken with HIV were shunned. At the time, some healthcare workers would not even touch AIDS patients, so it was a big deal when Diana did.
Others are creeped out by how much people still obsess over her.
I can't understand why people care so much about Princess Diana. Everyone I know who knows who she was seems to think that she's some big deal. She was a not-particularly-bright girl who happened to be born into a family that lives off of the British tax payers. Some people point out the fact that she did charity work. Well good for her; it's not like she's a freaking princess or anything. It's not like her only job is to have good PR.
She was a devoted parent and strived to raise her children with normalcy and affection. It doesn't sound that revolutionary, but typically, royal children were raised by nannies. Until Diana, no one had seen a royal hug or kiss their children in public.