Well I'd have to disagree with the original poster.
I've been Hilton diamond for more than a decade now and I'm pleased overall with the program. Diamond members receive more bonus points (ie more free stays), and we get the diamond desk to make requests for award stays at sold out hotels or high demand periods.
With the enforcement of the HH rules, Diamond members get access to the lounge period. That is a big benefit IMO. That ensures we get breakfast and internationally means you can sit and relax and have a drink in the evening.
The only change I could see them making would be to offer Diamond members free internet access. But given that most Hilton hotels seem to have some sort of outsourced internet provider thats a likely a costly benefit for the hotel.
Why complain that Gold members receive a lot of benefits? Good for them, and good for me as a diamond member that I receive the additional items above.